GVSU Geo 111-10 COMBINED 3

vadose zone

contains water only along grain boundaries and in the smallest pores and fractures

lithosphere

cooling of surface forms this strong outer shell

Porphyry deposits

copper orebodies formed in magma chambers

Foliated

flat layers of minerals 1.Slate 2.Phyllite 3.Schist 4.Gneiss

Ion

name given to an atom that gains or loses electrons in a chemical reaction

rock

naturally formed, coherent mass of minerals, may include organic debris

olivine; mantle

Ultramafic rocks contain __________ and are commonly found in __________.

mineral

naturally formed, inorganic, solid, crystalline strucutre

ocean acidification

one of the most threatening aspects of anthropogenic global change

igneous rocks are classified based on:

texture chemical and mineral compositions

Electrons

the lightest in weight or least massive of the basic atomic particles

The size of the volcanic fragments

What differentiates welded tuff from volcanic breccia?

They both exhibit a vesicular texture.

What do pumice and scoria have in common?

Biotite

What do the pyroxene crystals convert to as the temperature of magma cools?

streak

color of a mineral in its powdered form

streak

color of the powder left behind when a mineralis scraped across a surface

sea stack

column of rock remaining after the collapse of a sea arch

Gabbro

What rock is mafic in composition and phaneritic in texture?

Perennial Stream

A stream that always has water flowing in it.

Atoms of the same element, zinc for example, have the same number of ________.

A. protons in the nucleus

lee side

the side of something that is sheltered from the wind

continental fit, fossils, glaciers

what evidence do we have for plate movement

neutron

neutral charge

Andesite

What rock is intermediate in composition and aphanitic in texture?

Diorite

What rock is intermediate in composition and phaneritic in texture?

Basalt

What rock is mafic in composition and aphanitic in texture?

Scoria basalt

What rock is mafic in composition and vesicular in texture?

diamictite

Which sedimentary rock when found at an outcrop is indicative of past glacial activity?

convergent

Which tectonic boundary is responsible for the most powerful and destructive earthquakes recorded?

Liquefaction

Which type of earthquake destruction can cause houses to sink into the ground?

p-wave velocity

a measure of the velocity of sound waves through Earth materials with distance vs. time.

driving forces

A force that causes the movement of tectonic plates

Methane

A gas produced by bacteria from hydrogen and carbon dioxide

ultramafic

A generally dark or greenish igneous rock composed chiefly of mafic minerals rich in magnesium and iron.

atmosphere

A mixture of gases that surrounds a planet or moon.

Most lava crystallizes to form igneous rocks with phaneritic (coarse-grained) textures.

False

What are the divisions of Geology?

Historical and Physical Geology

Lithosphere

Layer of Earth consisting of the crust and rigid portions of the upper mantle

Two main carbonate minerals

Limestone and Dolostone

parts that make magma

Liquid, Solid, and Gas

fine grained

Rocks where the individual grains are too small to see. Fine-grained or glassy rocks require a microscope.

magnetic filed

deep inside earth in its liquid outer core help create this

Pegmatitic

deep within earth in the presence of water

benioff zone

earthquake zone resulting from from a collision between 2 crustal plates (one overriding the other)

Intraplate earthquakes

earthquakes occurs within the plate, away from plate boundaries

double diffusive convection

form of convection driven by two different density gradients

igneous rocks

form when magma or lava cool to a solid form

____ is a coarse-grained intrusive igneous rock composed predominantly of feldspar and quartz.

granite

penetrate well below the regional water table surface

To ensure a continuous supply of water, a well must do what?

geology

is the science that pursues an understanding of planet Earth

Texture

is used to describe the overall appearance of a rock based on the size, shape, and arrangement of interlocking minerals

seamount

isolated peak of volcanic acivity underwater. some rise above sea level, some do not.

Felsic minerals melt before ____ minerals.

mafic

troposphere

the lowest region of the atmosphere, extending from the earths surface

Atmosphere

the mass of air surrounding the Earth. Protects from suns heat and UV rays. Thin and tenuous compared to earth.

groundwater

the mass of water that flows beneath earths surface

bed load

the material the current carries along the bed by sliding and rolling

angle repose

the maximum angle at which a slope of loose material will lie without cascading does

geochemical cycles

the movement of elements between Earth's land, water, atmosphere, and living things

discharge

the movement of groundwater to the surface is the opposite if recharge

hydraulic gradient

the ratio of the vertical drop to flow distance

continental slope

the slope between the outer edge of the continental shelf and the deep ocean floor.

Solifluction

the slow downward movement of the surface layer on a slope, occurs where the ground freezes deeply, when the surface thaws becomes saturated by rain and flows over the frozen layer

Physical and Chemical

two kinds of weathering

immiscible

two liquids which can not mix together (rarely magmas can unmix and form 2 immiscible liquids)

Scoria

vesicular rock commonly having basaltic or andesitic compositions

Ground failure

what type of earthquake hazard causes landslides, liquefaction

differentiated planet

A planetary body in which various elements and minerals are separated according to density and concentrated at different levels. Earth, for example, is differentiated, with heavy metals (iron and nickel) concentrated in the core; lighter minerals in the mantle; and still lighter materials in the crust, hydrosphere, and atmosphere.

transform boundary

A plate boundary in which two tectonic plates move horizontally past one another

divergent boundary

A plate boundary where two plates move away from each other.

transform boundary

A plate boundary where two plates move past each other in opposite directions

vesicular

Adjective used to describe a rock containing vesicles

bay mouth bar

An exposed sandbar attached to a headland adjacent to a bay and extending across the mouth of the bay.

glacial erratic

An ice-transported boulder that was not derived from the bedrock near its present site.

Change in the composition of magma caused by melting surrounding host rock is known as ________.

B. assimilation

Which one of the following mineral groups exhibits a sheet-like silicate structure?

B. clays

The strong tendency of certain minerals to break along smooth, parallel planes is known as ________.

B. cleavage

The ________ refers to the ice and snow that exists on the Earth's surface.

Cryosphere

________ is named for a prominent, volcanic mountain range in western South America.

D. Andesite

High temperature

Decrease viscosity

Deep-ocean trenches are formed by _______.

Deep-ocean trenches are formed by _______.

reverse and thrust fault

Hanging wall moves up and over the footwall. Caused by compression.

turbulent flow

Irregular flow with random variations in pressure.

Objection to Wegener's Pangaea proposal

Its inability to provide a mechanism for continental drift

What happens at a divergent plate boundary?

Plates move appart

lithosphere

Spear of rock. 100-250 km thick. Thin in ocean basin, thick in older oceanic crust.

subduction

The process of plate consumption is called

Water Table

The upper level of the saturated zone of groundwater

electrons

Negatively charged particles

rock

a solid aggregation of minerals

artesian spring

a spring whose water flows from a crack in the cap rock over the aquifer

rhyolite, granite

felsic

Pegmatitic Granite

felsic intrusive pegmatitic

Granite

felsic intrusive phaneritic

texture, composition

igneous rocks are characterized by

Hardness

relative resistance to scratching

abyssal hills

relatively small hills on the abyssal floor. cover 80-85% of the seafloor.

Theory

tested and confirmed hypothesis

fracture

Absence of cleavage when a mineral is broken

Felsic composition

Increase viscosity

Ridge Push

Motion caused by gravity that slides

intraplate volcanism

activity within a tectonic plate

Elements

basic building blocks of minerals .

Electrons

orbit the nucleus

True

*T/F:* Quartz is very common in a rock with a felsic composition.

Shearing

(created by tectonic stresses) between grains or along discrete planes will stretch pre-existing mineral crystals

earth's deep subsurface

(rock) melting

True

*T/F:* A factor that influences the chemical composition of magmas is melting and assimilation of some of the rock of the magma chamber walls.

ion

A charged atom

natural gas

A fossil fuel in the gaseous state

Oxbow Lake

A meander that has been cut off from the river

electron

A stable subatomic particle with a negative charge

Which two regions currently contain the world's last remaining ice sheets?

Antarctica and Greenland

Extrusive rock Quickly

Basalt in an... Cools...

Kilauea and Mauna Loa are ________.

C. basaltic shield volcanoes

Granite

Coarse grained (phaneritic)

No

Is volcanic glass a true mineral?

Cleave

Not all minerals ______

Convergent Plate Boundaries

Plates move toward one another and release water into the mantle

covalent bond

Sharing of electrons between atoms

Sulfur

Smells/Yellow

Law of Original of Horizontality

The law states that layers of sediment were originally deposited horizontally under the action of gravity.

atomic number

The number of protons in an atom

Decompression Melting

Upward movement of the earth's mantle to an area of lower pressure

Luster

appearance in reflected light

flux melting

fluid induced melting in the mantle when slabs heat up

Sulfate

gypsum is a type of

Andesitic Lava Flow

medium viscosity lava flow

metamorphic rock

melting, forming magma

Vesicular

near earths surface, as gas bubbles through the lava

In the formation of an ingenious rocks, melting needs to occur first, which happens in the ____ area.

source

runoff

sum all precipitation that flows over the land surface

settling velocity

the speed with which suspended particles of various weights to settle to the bed

granite

which rock is best suited for radiometric dating?

Metamorphic rocks

• Formed by "changing" preexisting igneous, sedimentary, or other metamorphic rocks • Driving forces are heat and pressure

How old is the universe?

13.8 GA

isomorphs

2 minerals with the same crystalline structure that are not solid solution end members ex: halite( NaCl)= table salt and Sylvite(KCl)= potassium salt same structure but there is no complete mixing between the two (no salt that is half Na and half K)

Modern seafloor spreading rates range from

2 to 15 centimeters per year.

outer core

2,255 km thick, liquid

Pangaea happened

200 Million years ago

what temperature does metamorphism occur at ?

200C(sedimentary->metamorphic)-1000C (metamorphic->igneous)

How many years does one complete cycle of precession take?

26,000

How many major mass extinction events have occurred throughout Earth's history?

5

What is the average rate of seafloor spreading in modern oceans?

5 cm per yr

ground motion, ground failure, tsunami, fire, disease

5 earthquake related hazards

weathering, erosion, transportation, deposition, lithification

5 steps to forming a clastic rock

How much lithospheric plates move in a year

5cm a year!

What is the critical latitude for incoming solar radiation, which could affect the formation of ice sheets?

65° N

what temperatures do magmas erupt at?

800 to 1300 degrees C

why cant magmas with very different compositions mix well?

??????

isograd

?A line on a map joining those rocks comprising the same metamorphic grade.

remanant magnitism

?aka Paleomagnetism the magnetization left behind in a ferromagnetic material after an external magnetic field is removed

sill

A _ is formed when magma intrudes between existing sedimentary layers

Aquifer

A body of rock or sediment that stores groundwater and allows the flow of groundwater.

intermolecular force

A bond that occurs when several types of weak bonds attract a molecule (a combination of atoms) to another molecule

metallic bond

A chemical bond formed when electrons are shared widely by many atoms

spheroidal weathering

A chemical weathering process in which the sharp edges and corners of boulders and rocks are weathered in thin plates that create a rounded, spheroidal form.

If all the ice that currently exists on Earth were to melt in the next 300-400 years, which of the following cities would have the least difficulty?

Denver

graded bedding

Depositional feature of sedimentary rock in which particles are progressively heavier and coarser toward the bottom layers of bedding.

cross bedding

Depositional feature of sedimentary rock that forms as inclined layers of sediment are carried forward across a horizontal surface

The location on the Earth's surface directly above the point of slippage

Describe the epicenter

What type of plate boundary do you see in seafloor spreading and oceanic ridge?

Divergent

What type of plate boundary do you see in continental rift?

Divergent

Non-Foliated Metamorphic Rocks

Do not have a layered or banded appearance, result of contact metamorphism

Metamorphism

During the recrystallization and deformation of original minerals a rock due to increased pressures, temperatures, or tectonic stress

Sea level will rise during a glaciation because glaciers are pushing down on the crust, which will deform the ocean basins (T/F)

False

The currently accepted age of Earth is approximately 4.5 million years.

False

The terms "rock" and "mineral" have the same meaning.

False

Rhyolite

Felsic

four composition groups:

Felsic igneous rocks Intermediate igneous rocks Mafic igneous rocks Ultramafic igneous rocks

Which planktonic marine organism, often found in sea sediments, can be used to make interpretations about past climates?

Foraminifera

Biodiesel

A diesel substitute produced by extracting and chemically altering oil from plants

Metamorphic Facies

A distinct mineral assemblage produced by unique metamorphic conditions, Provides a better characterization of pressures & temperatures rocks experienced than by rock type alone

Under what conditions will a glacier remain stationary?

Glacial fronts remain stationary when melting and snow accumulation are equal.

Under what conditions will the front of a glacier remain stationary?

Glacial fronts remain stationary when melting and snow accumulation are equal.

andesitic

A geologist sends you a sample that was collected in the field. You find that it is a gray-colored igneous rock containing amphibole and intermediate plagioclase feldspar. Using Bowen's Reaction Series as a guide, how would you describe its composition?

very fast

A glassy igneous texture is formed by ___ cooling

Topographic Map

A map that shows surface features of an area such as mountains, valleys, plains, and plateaus by using contour (isoline) lines to show changes in elevation

mafic

A material having high contents of magnesium (Mg) and iron (Fe), generally accompanied by a decreased amount of silica. Mafic mineral is A generally dark-colored, silicate mineral with a high magnesium (Mg) and iron (Fe) content

density

A measure of how much mass is present per given volume of a substance

The formation of a hanging valley occurs when which of the following conditions exists?

A hanging valley occurs when a tributary glacier enters a larger glacier and hasn't cut the valley as deep as the trunk glacier has.

quiet and effusive

A hot spot that occurs in oceanic crust is likely to produce which of the following types of eruptions?

theory

Has already been through testing by various scientists and is generally accepted as being an accurate explanation of an observation

Surface waves

Have the slowest velocity

Regional Metamorphism

Heating accompanied by tectonic stress produces both chemical and physical alteration of preexisting rocks, Caused by tectonic compressive stress at or near convergent plate boundaries

Roughly how much extraterrestrial material falls on Earth annually?

A thousand tons.

accretionary prism

A prism- or wedge-shaped, structurally complex zone of faults, folds, and mostly metamorphosed rocks that form along the upper parts of a subduction zone; material derived from sediment contributed by adjacent volcanoes or a continent, along with oceanic crust scraped off the downgoing slab

Laterite

A red, highly leached soil type found in the tropics that is rich in oxides of iron and aluminum

basement complex

A series of igneous and metamorphic rocks lying beneath the oldest stratified rocks of a region. In shields, the basement complex is exposed over large areas.

dike

A sheetlike intrusion that cuts across any layers in a host rock, commonly formed with a steep orientation

Obsidian

A shiny, usually black, volcanic glass. Obsidian forms above ground from lava

Karst

A type of landscape in rainy regions where there is limestone near the surface, characterized by caverns, sinkholes, and valleys

Which of the following statements regarding the scientific method is TRUE?

A theory is a hypothesis that has withstood many scientific tests.

What size sediment can be transported by glaciers?

All sediment sizes can be transported by glaciers.

Contental Drift

All the continents are constantly moving and started out as pangea

Hydrosphere

All the water on earth

Rock Cycle

Allows us to visualize the interrelationships among different parts of the Earth system

under pressure rises above the aquifer level

An artesian system is present when groundwater_

extrusive

An igneous rock that forms when magma is erupted onto Earth's surface; syn. volcanic rock.

fine sized grains

An igneous rock that is formed from the cooling of lava is going to have what sized grains?

plutonic

An igneous rock that solidified at depth rather than on the surface; syn. intrusive rock

intrusive

An igneous rock that solidified from magma below Earth's surface; syn. plutonic rock

felsic

An igneous rock with a felsic composition, including granite, a light-colored igneous rock that contains abundant feldspar and quartz.

Pegmatite

An igneous rock with very coarse-grained texture in which the minerals are centimeters long is called a __________________.

dendritic drainage

An irregular stream drainage network that resembles the limbs of a branching tree.

peridotite

An ultramafic igneous rock generally containing abundant olivine, commonly with smaller amounts of pyroxene

Mineral

Anything naturally occurring in organic solid that possesses an orderly internal structure and a definite chemical composition.

Mineral

Anything naturally occurring inorganic solid that possesses an orderly internal structure and a definite chemical composition.

phosphate

Apatite is the most important ______

How old is the solar system ?

Approx 4.56 GA

When did the supercontinent Pangea begin to break apart?

Approximately 200 million years ago.

How old are the earliest fossil remains?

Approximately 3500 million years.

How old is Earth?

Approximately 4.5 billion years.

Living organisms have been on Earth for _______ of Earth's history.

Approximately 80%

During the last glacial maximum, the position of sea level occurred at what elevation relative to its position today?

At the last glacial maximum, sea level was about 100 meters (~300 feet) lower than it is today.

mantle plumes

At which of the following tectonic settings would you expect to find volcanoes producing significant amounts of very fluid, high-temperature lavas?

subduction of an oceanic plate under a continental plate

At which of the following tectonic settings would you expect to find volcanoes producing the highest volumes of pyroclastic material?

an oceanic plate subducted beneath a continental plate

At which type of tectonic setting would you expect the development of composite volcanoes?

mantle plumes

At which type of tectonic setting would you expect the development of shield volcanoes?

Solar energy energizes which of the Earth's components?

Atmosphere, biosphere, and hydrosphere

ionic bonding

Atoms gain or lose outermost (valence) electrons to form ions

What are the two important processes involved in lithification of sedimentary rocks?

Cementation and compaction

Nature of Magma

Consists of three components: Liquid portion = melt Solids, if any, are silicate minerals Volatiles = dissolved gases in the melt, including water vapor (H2O), carbon dioxide (CO2), and sulfur dioxide (SO2)

mountain formation

Continental-continental collision results in a

What evidence did Geologist used in the theory that continents where once one?

Continents look like a Jigsaw game Mesosaurus- small fresh water reptile that couldn't live in salt water

What is Continental drift(ing)

Continents move freely over Earth's surface, changing position relative to each other

Ocean-Ocean convergence

Convergent plate boundary involving two slabs of oceanic lithosphere

magma

Hot fluid or semi-fluid material below or within the earth's crust from which igneous rock are formed on cooling.

Composition

How are diorite, andesite, and scoria related?

Composition

How are gabbro, basalt, and scoria related?

Texture

How are granite, diorite, and gabbro related?

Composition

How are granite, rhyolite, pumice, and obsidian related?

Texture

How are pumice, obsidian, and scoria related?

Texture

How are rhyolite, andesite, and basalt related?

Submerging them in cold mercury

How did Bowen cool the melted powdered mafic minerals in his experiments?

The water table elevation decreases

How does the water table change around a pumping water well?

440 meters

How much did the summit of Mount St. Helens lower after its eruption in 1980?

Water table will fall

How will the water table respond when there is a drought?

What are the two most abundant elements in the solar system?

Hydrogen and Helium

blocks of rock will slide relative to one another along a fault, causing an earthquake

If the stress applied to the rock is greater than rock strength, what happens?

____________ rocks form by crystallization and consolidation of molten magma.

Igneous

The Difference between Igneous, metamorphic and sedimentary rocks

Igneous rocks are formed beneath the surface of the earth or at the surface after a volcanic eruption when magma crystallizes. Metamorphic rock forms when sedimentary rock deep inside the earth is subjected to great pressure or intense heat. Sedimentary rocks are dissolved particles of rocks.

Pyroclastic/welded

Igneous rocks composed of rock fragments of pumice and hot volcanic ash are said to have a(n) __________________ texture.

Intrusive

Igneous rocks that form when magma solidifies deep beneath the surface of the land are called __________________ igneous rocks.

The water table is lower than the stream surface

In a losing stream,_

The eruption was so large that the magma chamber under Crater Lake partially emptied, causing the volcano to become unstable and collapse.

In addition to rock deposits, what evidence do we have that the eruption that preceded the formation of Crater Lake was very large?

amount of gas in the magma

In addition to viscosity, which of the following parameters has an influence on whether a volcanic eruption will be effusive or violent?

Diamonds

- Best known as gems but commonly used as abrasives - Originate at great depths because high pressure is required - Crystals are disseminated in ultramafic rock called kimberlite

Physical Characteristics of a Mineral

- Color - Luster - Streak - Habit - Hardness - Cleavage

Continental drift hypothesis

-Supercontinent called Pangaea began breaking apart about 200 million years ago -Continents "drifted" to present positions -Continents "broke" through the ocean crust

Composite Volcanoes

-also known as "stratovolcano" -comes from fairly viscous andesitic magmas - consists of both ash and lava layers

dark silicates

-contain iron and/or magnesium, dark in color, 3.2-3.6 -olivine group and proxene group

why are lithologic units often different from chronologic units?

...??

The typical elevation of the land surface occurs within a range of _____ above sea level.

0 to 1 km

What percentage of the atmosphere is carbon dioxide?

0.0395%

Nebular Hypothesis

1) Solar nebula contracts 2) Nebula begins to form rotating cloud 3) Continued gravitational collapse causes the nebula to form a rotating disc 4) Increased heat and pressure forms a protosun and plantesimals 5) Fusion begins. Solar winds push light elements far away 6) Solar system forms. Rocky planets close gaseous planets far away

Match the layer of the atmosphere with the correct description. Stratosphere

The second layer of the atmosphere where temperatures gradually increase from bottom to top

Stratosphere

The second-lowest layer of Earth's atmosphere.

crystal shape

The shape reflects the arrangement of atoms within the mineral (Cubic, hexagons, rectangular prisms)

Site B

The site on the accompanying figure that would mostly likely form a rock that is fine grained (has small crystals but is not glassy) is:

Fission

The splitting of an atomic nucleus to release energy.

craton

The stable continental crust, including the shield and stable platform areas, most of which have not been affected by significant tectonic activity since the close of the Precambrian Era.

glaciers

In terms of freshwater storage, groundwater is second only to which of the following sources?

____________ was an important 18th century English geologist and proponent of uniformitarianism.

James Hutton

Near subduction zones

The highest magnitude earthquakes typically occur?

volcanic bomb

Large blobs of magma that harden in the air, the shape is caused by the magma spinning though the air as it cooled into spindle, breadcrust, polygonally joined blocks

Stratovolcano

Large, cone-shaped formed by accumulation of gas-rich intermediate to felsic lavas

they formed at depth and have been exposed by uplift and erosion

Most igneous rocks never reach the surface. However, igneous rocks other than those formed in volcanoes are found exposed on many parts of Earth. How do you account for this phenomenon?

silicates

Most important mineral group

Most magma is emplaced at depth in the earth

Most magma is emplaced at depth in the earth

The factors that control crystal size in rocks

Most minerals have well formed crystals if it grows with lots of room, most don't have lots of room.

Slab Pull

Motion that is caused by weight of cold, dense plates sinking into the mantle

The largest topographic change relative to sea level on Earth is at

Mount Everest.

Adirondacks

Mountain range in upstate New York that is separated from the Green Mountains of Vermont by Lake George and Lake Champlain

Secondary waves

Move by shaking from side to side Vibration is perpendicular to the direction of wavepath

Contact Aureole

NONFOLIATED Metamorphic Rocks intrude

Lava

Name given to magma on the Earth's surface

Sulfates

Raw material used for making plaster (Drywall)

Oolitic limestone

Texture: Crystalline General Appearence: Grains uniform in size and very spherical. Grains appear to have crystalline material or cement holding them together. Diagnostic Features: Spherical grains effervesces readily in dilute HCl. Color: very light (white to cream).

Dolostone

Texture: Crystalline General Appearence: Very fine-grained, interlocked crystals. Grains are uniform in size Diagnostic Features: Sample effervesces only when the rock is powdered. Hardness greater than fingernail, will not scratch glass.

volcanic

SOLIDIFIED MAGMA (igneous rocks generally classified on the basis of their chemical composition because they are generally too fine grained to identify the minerals present. they can also be classified based on their eruptive mechanism that produced them etc.) ex basalt

Stick-slip

Slip between the rocks across the fault is sudden and violent (movement along locked faults)

ripple marks

Small waves of sand that develop on the surface of a sediment layer by the action of moving water or air.

There are many bandits in the region, who contribute to the instability and danger of the region.

The Afar region is one of the most environmentally challenging areas on the planet. The geopolitics of Afar are equally challenging. Why?

Which of the following changes are the result of glacier retreat following the last Ice Age?

The Channeled Scablands formed as Lake Missouri drained.

Permiability

The ability of membrane to let things in and out

shooting flow

The accelerated flow along a mountain slope during a downslope windstorm

what is the difference between sulfides and sulfates?

The amount of oxygenations they have

Luster

The appearance or quality of light reflected from the surface of a mineral

continental drift

The concept of the movement of continents and other landmasses across the surface of the Earth.

isotasy

The condition of equilibrium, comparable to floating, of the crust resting on the solid mantle

increases the hydraulic gradient

The cone of depression _ near a wall

The statement "planet with a planet" refers to which part of Earth?

The core.

relief

The difference in elevation of one feature relative to another.( syn. topographic relief)

at the focus or hypocenter

The slippage of an earthquake starts_

the zone of saturation

The majority of groundwater is stored within which of the following zones?

During the late nineteenth and early twentieth centuries, direct observations showed that a glacier in Switzerland flowed forward in the downhill direction while its snout (terminus) was retreating higher up the valley? Which of the following explains these observations in a rational, scientific way?

The melting rate of ice in the glacier exceeded the rate at which new snow and ice were added to the glacier.

Atom

The smallest part of matter that still retains the characteristics.

How would a snow line on a glacier move as a glacial front is advancing?

The snow line would move downslope.

Using a calendar year as an analogy to the geologic time scale, when do the oldest anatomically modern humans appear on Earth?

The oldest human fossils show up at about eleven minutes to midnight on December 31st.

crust

The outermost "skin" of our planet

Define Thermosphere

The outermost layer of the atmosphere where temperatures are extremely high due to solar radiation

Match the layer of the atmosphere with the correct description. Thermosphere

The outermost layer of the atmosphere where temperatures are extremely high due to solar radiation

CO2 sequestration

The process of removing carbon dioxide from the atmosphere and making it unavailable for release back to the air.

Lithification

The process that converts sediments into solid rock by compaction or cementation.

continental rifting

The pulling apart of a continent, forming a low, fault-bounded trough (continental rift); may lead to a divergent plate boundary that leads to seafloor spreading and splitting apart a continent.

runaway climate change

The point at which the effects of climate change cause additional effects that add to the warming(positive feedback loops), so that warming is no longer stoppable no matter how much humans reduce their greenhouse gas emissions. Also referred to as the passing tipping points or the points of no return.

Which of the following forces is important in driving plate tectonics?

The pulling force of a lithospheric slab, the pushing force of a plate sliding off a mid-ocean ridge, and the suction force of a retreating subduction zone.

luster

The reflection of light from the surface of a mineral, especially its quality and intensity; the appearance of a mineral in reflected light

stratosphere

The region of the atmosphere above the troposphere and below the mesosphere

Half-Life

The time required for one half of the atoms of a radioisotope to emit radiation an decay products

Metamorphic Processes

The transformation of preexisting rock into texturally or mineralogically distinct new rock as a result of high temperature, high pressure, or both, but without the rock melting in the process.

why does Chile have volcanoes, earthquakes, ore deposits, good seafood , and great wine?

There is a subduction zone along Chile's coast these are all associated with subduction zones the seafood is due to proximity to a deep ocean trench and the wine is due to fertile soils from volcanic ash rich in P and K

The value of the mineral or metal extracted Its concentration in the ore

There two major factors determining the profitability of the mining an ore

Plagioclase feldspars

These are feldspars that will contain calcium, sodium, or both - but NO potassium?

Compared to the age of Earth accepted as correct today, how did 17th and 18th century proponents of catastrophism envision the Earth's age

They believed Earth to be much younger than current estimates.

How can tree rings provide information about past climates?

Thickness and spacing of tree rings reflect environmental conditions

oceanic crust

Thin, earth crust that exists beneath the ocean basins,deep oceans

Dolomite

Thin, platy cream-colored crystals possibly has black specks between crystals.

hardness

This is the resistance of the mineral to abrasion or scratching. (measures on the Moh 1-10 scale)

Luster

This property describes the appearance of reflected light from the mineral's surface.

Volcanic Breccia / Tuff

Tiny bits of lava and ash that get shot out of a volcano can become stuck together. These particles cool and harden, they make tuff.

Basalt is the aphanitic or fine-grained equivalent of gabbro.

True

Calcite and dolomite are both carbonate minerals.

True

Crater Lake in Oregon actually occupies a volcanic caldera.

True

Glassy igneous rocks form when magma cools too fast for mineral grains to grow.

True

Graphite and diamond have the same chemical compositions, but different crystalline structures.

True

In an open system both energy and matter flow into and out of the system.

True

Internally, the Earth consists of spherical shells with different compositions and densities.

True

Magma generation at depth almost always involves partial melting, not complete melting of the source rock.

True

Plutonic rocks are intrusive and generally consist of mineral grains coarse enough to be readily visible in a hand sample.

True

The addition of water can lower partial melting temperatures in silicate rocks.

True

The doctrine of uniformitarianism implies that the current forces and processes shaping the Earth have been operating for a very long time

True

The micas, biotite and muscovite, both exhibit one direction of cleavage.

True

The only continental ice sheets left on Earth today are in Greenland and Antarctica. (T/F)

True

The viscosities of magmas increase with increasing silica content.

True

false

True or false Groundwater migrates from areas of low pressure to areas of high pressure

False

True or false: Tsunamis travel as a single wave across the ocean

false

True or false: the first life on earth developed during the Cambrian Period.

Olivine, potassium feldspar, quartz

Use your understanding of Bowen's reaction series and crystal settling to determine which of the following mineral associations should not be found in nature.

metallic bonding

Valence electrons are free to migrate among atoms

hot spot

Very hot pockets of magma close to surface that create volcanoes

Which statement accurately describes continental shields?

Very old, stable regions composed of igneous and metamorphic rocks

Scoria

Vesicular

role of volatiles

Volatiles (primarily water) cause rocks to melt at lower temperatures Important factor where oceanic lithosphere descends into the mantle

tuff

Volcanic rock composed of consolidated volcanic ash and other tephra, commonly including pumice, crystals, and rock fragments

pumice

Volcanic rock, especially of felsic or intermediate composition, containing many vesicles (holes) formed by expanding gases in magma.

Volcanoes and Earthquakes

Volcanoes located at plate boundaries. Earthquakes generated by movements between plates

porosity

Volume of pore space in a material

Earthquake activity, change in heat flow from the volcano's surface, bulges on the volcano's surface, increase in gas emissions and hydrothermal activities

What are some warning signs of a volcano's imminent eruption?

Volatiles

What are substances that have a tendency to evaporate and are stable as gases?

K+ Feldspar, Muscovite, and Quartz

What are the 3 final minerals that will form as the magma cools?

limited to a short span of geologic time, but widely distrubuted

What are the characteristics of an index fossil?

Lapilli

What are the pea sized volcanic fragments composed of glassy lava and scoria basalt?

cementation and compaction

What are the two important processes involved in lithification of sedimentary rocks?

Dormant

What are volcanoes called that have not erupted in hundreds to thousands of years, but have the potential to erupt again?

the number of protons in the nucleus

What atomic particle in an atom is the same for each element?

a dimple in the water table surface due to water pumped faster than an aquifier can be replenished

What best describes the cone of depression

Reversing the direction of flow in the aquifer subsidence saltwater contamination

What can result from excessive pumping of groundwater?

Pyroxene

What do the olivine crystals convert to as the temperature of magma cools?

Amphibole

What do the pyroxene crystals convert to as the temperature of magma cools?

lahars

What do we call mudflows produced by the melting of snow and glaciers on composite volcanoes?

bombs

What do we call pyroclastic material, ejected during a volcanic eruption, composed of incandescent lava that is greater than 64 millimeters (2.5 inches) in diameter?

surface waves

What do we call seismic waves that are transmitted along the outside of earth?

Most likely K+ Feldspar

What does pink coloring mean in a rock?

Smoking Mountain

What does the volcano's name, Erta Ale, mean in the local Afar language?

Nickle

What element does peridotite contain, making it toxic to plants?

iron

What element is principally responsible for making olivine, pyroxene, amphibole, and biotite dark?

cenozoic

What era are we currently in?

spring

What groundwater feature forms where the water table intersects with the Earth's surface, creating a natural outflow of groundwater?

parent isotopes turn into daughter isotopes

What happens during radioactive decay?

Bowen's reaction series

What has a continuous track in which there's a progressive change from calcium-rich to sodium-rich plagioclase?

Bowen's reaction series

What has a discontinuous track in which each step yields a different class of silicate mineral?

Basaltic sill

What is a black, fine-grained tabular intrusion between two layers of horizontal sedimentary rock?

diorite

What is a coarse-grained rock composed of intermediate plagioclase feldspar and pyroxene?

Pyroclastic flow or nuée ardent

What is a fast-moving avalanche of hot gases and volcanic pieces?

rhyolite porphyry

What is a fine-grained igneous rock composed primarily of very small crystals of potassium feldspar and a few large crystals of quartz?

Phenocryst

What is a large crystal surrounded by a finer-grained igneous rock?

Fissure eruption

What is a single eruption that occurs in a linear pattern through an extremely elongated vent?

Lava dome

What is a steep feature called formed from the eruption of rhyolitic lava?

Xenolith

What is a stoped block called that does not melt entirely during assimilation, but rather becoming surrounded by new igneous rock?

Fissure

What is a vertical elongated crack that serves as a conduit?

Jokulhaup

What is a volcanic eruption under a glacier called?

Lahar

What is a volcanic mud-and-debris flow that resembles fluid concrete?

A mineral that makes up a relatively small portion of the total rock composition

What is an accessory mineral?

Krakatau, Indonesia, 1883

What is an example of a phreatomagmatic eruption?

Obsidian

What is an example of a rock with a glassy texture?

Pumice

What is an example of a rock with a vesicular texture?

Phreatomagmatic eruption

What is an explosive (pyroclastic) eruption involving the reaction of water with magma?

Fine-grained

What is another textural term for aphanitic?

Coarse-grained

What is another textural term for phaneritic?

matching up rocks of similar age in different regions

What is correlation?

Glassy texture or a volcanic glass

What is developed when magma cools so quickly that crystals do not have time to develop?

Vesicular

What is formed when magma has an excessive amount of dissolved gasses?

Depth of the magma below the earth's surface

What is least likely to cause variation of the original composition of magmas?

Batholith

What is light-colored granite, an intrusive, coarse-grained, igneous rock?

Ferromagnesian silicate

What is olivine classified as?

Olivine

What is peridotite mostly composed of?

Basalt

What is the Rosetta stone made of?

Crater

What is the circular depression at the top of a volcano?

composition and texture

What is the classification of igneous rocks based on?

The shape that the water table takes on near a pumping well

What is the cone of depression?

Batholith

What is the largest of all the plutons?

The shape of the clasts

What is the main difference between conglomerate and breccia?

Granite

What is the most common igneous rock?

Fractional crystallization

What is the process by which a magma becomes progressively more felsic as it cools?

Stoping

What is the process of magma assimilating wall rock as blocks of it break off and sink into the magma?

Assimilation

What is the process of magma in a magma chamber melting the surrounding wall rock and incorporating it into itself, thus altering the composition?

andesite porphyry

What is the rock name of an intermediate rock with two distinct grain sizes?

The amount of time over which the number of parent isotopes decreases by half

What is the scientific definition of a half-life?

sill

What is the term for a tabular igneous pluton that occurs in an orientation that is concordant with the bedding surfaces of adjacent sedimentary rocks?

dike

What is the term for a tabular igneous pluton that occurs in an orientation that is discordant with the bedding surfaces of adjacent sedimentary rocks?

Tephra

What is the term for an unconsolidated accumulation of any size of pyroclastic grains?

seismic

What is the term for stored-up energy released by earthquakes?

batholith

What is the term used to describe a very large, widespread, and deep intrusive body of igneous rock?

Magma chamber

What is the underground zone where magma accumulates?

Pegmatite

What is the very coarse-grained igneous rock that contains crystals up to tens of centimeters across and forms in dike-shaped intrustions from water-rich melts?

Olivine

What is the very first crystal to form as magma begins to cool?

Vent

What is the volcano's opening to Earth's surface called?

Pillow basalts; Pillow basalts are bulbous flows of molten basalt, low in silica, which cool and harden as they are expelled into seawater.

What kind of basalts are formed in a submarine environment?

Extrusive igneous rock

What kind of igneous rock is dark-colored, fine-grained basalt?

cross-bedding

What kind of sedimentary structure is represented in this photo? (hint: these are sandstones)

It is one of only a few volcanoes that have permanent lakes of molten lava in their craters.

What makes Erta Ale so unique among other active volcanoes in the world?

Quartz

What mineral forms at the very lowest temperature?

Muscovite

What mineral is a silicate

Mud flows

What normally forms volcanic breccias?

Iron and magnesium

What other two elements can be found in olivine?

0.62%

What percentage of Earths water is in the form of groundwater?

94%

What percentage of earths liquid freshwater is in the form of groundwater?

Columnar jointing

What produces hexagonal columns in cooled near-surface lava flows?

Welded tuff or volcanic breccia

What rock can be any of the 3 compositions and but only pyroclastic in texture?

Peridotite

What rock composes the upper part of the earth's mantle?

Vesicular

What rock has a very rough surface but is very lightweight?

Obsidian

What rock is either felsic or intermediate in composition and glassy in texture?

Pumice

What rock is either felsic or intermediate in composition and vesicular in texture?

Rhyolite

What rock is felsic in composition and aphanitic in texture?

Granite

What rock is felsic in composition and phaneritic in texture?

Welded tuff

What rock is formed from volcanic fragments classified as ash (sand grain) in size?

Volcanic breccia

What rock is formed from volcanic fragments that are larger than sand grain (ash) in size?

Scoria

What rock is most often seen in rock gardens or in dry saunas because it is inexpensive and very lightweight?

Granite

What rock is phaneritic in texture and composed of quartz, muscovite, and K+ feldspar?

Peridotite

What rock is ultramafic in composition and phaneritic in texture?

Pumice

What rock type involves dissolved gas into magma?

A dike trunscates layers in a sedimentary succession

What scenario requires a geologist to use the principle of cross cutting relationships?

Bowen's reaction series

What shows the sequence in which different silicate minerals form during the progressive cooling of a mafic melt?

Mt. St. Helens

What stratovolcano recently erupted in the United States, killing many people, partly because it first blew sideways and produced a monstrous landslide, sending tons of ash skyward and blasted more than 1,000 feet off the mountaintop?

Pyroclastic

What texture are volcanic breccias and welded tuffs?

volcanic neck and dike

What two volcanic landforms are most apparent in the view provided at the Shiprock placemark?

Cool, felsic, gas-rich lava

What type of conditions will result in the most violent, explosive volcanic eruption?

Large crystals

What type of crystals do cooling intrusive magmas produce?

Calcium only

What type of feldspar is the first to form as magma begins to cool?

Phaneritic

What type of igneous rock texture has crystals that can be seen with the naked eye?

Rhyolite lava

What type of lava has more silica than basalt lava does, indicates the tendency for explosive activity, may freeze in the vent and emerge as a spine, and may form a lava dome above the vent?

Intrusive

What type of magma cools underground slowly?

Extrusive

What type of magma cools very quickly from a volcanic eruption?

Frothy, foamy, and very gas rich magma

What type of magma forms vesicular rocks?

Divergent

What type of plate boundary is Surtsey located along?

Coarse grained ground mass with a larger crystal

What type of rock textures will be formed from intrusive magma?

Ferromagnesian silicates

What type of rocks are in the discontinuous branch of Bowen's reaction series?

Fine grained ground mass with a smaller crystal

What type of rocks will be formed from extrusive magma?

Low viscosity

What type of viscosity of lava could build a shield cone, indicates an area that has little potential for explosive eruptions, is basalt, and has low silica content?

Bowen's reaction series

What was established by laboratory experiments in which mafic melt was quenched in mercury?

interpretations

What we interpret from the data we have: Data, by themselves, are not very useful until we analyze them in the context of existing ideas. Perhaps the data will confirm old ideas, or perhaps they will point out a need for a new interpretation

Granitic dike

What would be classified as a light-tan tabular intrusion that cuts vertically across layered country rock?

fault scarp

When a fault is expressed at a surface, it is called a _.

How did the earths moon form?

When an extraterrestrial object collided with earth and blasted part of the mantle into orbit which coalesced to form the moon

Extrusive

When lava solidifies (at or on the surface of the land), the rocks are classified as __________________ igneous rocks.

when the cone of depression of a second well intersects the deepest part of Well A

When might a well, Well A go dry?

More felsic

When rock is *partially* melted, how does the composition change in relation to the original rock?

What is continental rifting?

When the crust of the Earth breaks into large blocks that sink, generally causing a rift valley

Graded bedding

When the particles in a sedimentary layer gradually change from coarser on the bottom to finer sizes at the top, this is called ________________ ________________.

Expands

When water freezes it...

drawdown decreases with increasing distance from the well

When water is pumped from a well, drawdown occurs. Which of the following is a true statement regarding drawdown?

United States, Alaska

Where is the Redoubt volcano located that produced a giant, mushroom shaped cloud of ash that reached the stratosphere?

Shiprock, NM

Where is the most famous set of dikes located?

Circum-Pacific Belt

Where is the zone of the greatest seismic activity on earth?

Ocean-Continent convergence

Where oceanic lithosphere is subducting under continental lithosphere -Andes and Cascades

transform fault boundary

Where plates grind past each other without destruction of the lithosphere.

divergent boundary

Where plates move apart, mantle material comes up & makes a new sea floor.

Continuous

Which branch of Bowen's reaction series gives different varieties of the SAME mineral?

cross-cutting

Which concept could be used to relatively age date an igneous intrusion?

Within a river channel

Which environment would you expect to form sandstone?

Gabbro

Which mafic rock is felsic granite most similar to in *texture*?

Ultramafic

Which magma composition is usually very dark green?

Pyroclastic

Which magma rock texture is made from very hot and sticky ash?

Aphanitic

Which magma rock texture is too small to be seen with the naked eye?

The lava wells up on one side of the crater and forms a dark crust. As the crust cools, it flows across the lake driven by the churning lava below. Once it flows across the lake, the crust sinks down and the process begins again.

Which of the following accurately describes the motion of lava in Erta Ale's crater?

nature of surface material steepness of the slope intensity of rainfall

Which of the following are factors that will influence infiltration of groundwater?

Granite is phaneritic and rhyolite is aphanitic.

Which of the following best describes the difference between granite and rhyolite?

From A to B

Which of the following changes in conditions indicates melting of a solid rock?

organisms with overlapping ranges and geologically short lifespans

Which of the following characteristics is the most desirable for constraining the relative age of rocks?

limestone - evaporation of freshwater

Which of the following does NOT correctly match a rock with a possible environment in which that rock forms?

water vapor

Which of the following gases is most abundant in basaltic lavas?

Gold

Which of the following has the highest specific gravity?

obsidian

Which of the following igneous rocks contains no mineral crystals?

aquitards must be present both above and below the aquifer

Which of the following is a requirement for an artesian system to exist?

the distance between two wells that penetrate the zone of saturation

Which of the following is necessary to calculate hydraulic gradient?

offset fences

Which of the following might be seen where strike-slip movement has occured?

Hornblende

Which of the following minerals is a ferromagnesian silicate?

shaking particles at right angles to the direction of travel

Which of the following motions best describes the movement of S waves as they travel through rocks following the release of energy during an earthquake

Lake at E

Which of the following sites would have the slowest moving or least energetic current?

Steep slopes in a mountain

Which of the following situations would result in angular clasts?

bathiloth

Which of the following terms is best described as a massive pluton?

basaltic

Which of the following types of lava will most likely lead to a volcanic eruption of an effusive nature?

rhyolitic

Which of the following types of magma has the highest viscosity?

S waves

Which of the following types of seismic body waves travel only through solids?

unit 5

Which of the following units was most likely deposited within a lagoon?

composite volcanoes

Which of the following volcanic forms best describes large, nearly symmetrical structures composed of interbedded lavas and pyroclastic material primarily deposited from a central vent?

cinder cone

Which of the following volcanic types typically produces small, steep-sided structures composed of pyroclastic material?

Unconsolidated sediments

Which of the following would be the most unstable during an earthquake?

The zone of soil moisture

Which of the following zones is the location of the most biological activity?

A and C

Which of the letters shown on this figure would most likely include some mafic magmas?

P waves

Which of the three types of seismic waves travels through rock with the greatest velocity

Granite

Which rock could be classified as: a) a phaneritic rock. b) felsic in composition. c) could be found in a batholith. d) the coarse-grained equivalent of rhyolite.

igneous

Which type of rock is formed from the cooling of very hot material originating from below the surface of the Earth?

Surface waves

Which type of seismic waves generally cause the most structural damage as they travel through Earth?

Kilauea, Hawaii; Hawaii sits on a hot spot, far from any plate boundary.

Which volcanic feature is NOT related to plate-boundary magmatism?

Obsidian; arrowheads and spears

Which volcanic material is highly prized by native Americans because of its usefulness as weapons?

Krakatau

Which volcano eruption in 1883 shot so much volcanic ash into the atmosphere that it created spectacular sunsets around the world for years?

Eyjafjallajokull

Which volcanoes eruption in 2010 caused almost all air traffic across Europe to be shut down?

They were derived from the igneous rocks from which the islands were formed

While vacationing in hawaii you notice that the sands on the beach are composed of black sediments. What inferences can you make about these sediments?

fine-grained

While working in the field, you find a dike cutting across some sedimentary rocks. What grain size would you expect to find in this pluton?

Vulcan

Who was the Roman god of fire?

The lava that flows out of shield volcanoes is more fluid than the lava that flows out of composite volcanoes.

Why are shield volcanoes wider than composite volcanoes?

The volcano is still active, and a new volcanic peak has formed.

Why does Crater Lake have an island in it?

it is less dense than the surrounding rock

Why does magma have a tendency to rise after its formation

meandering

Winding back and forth

The dark crystals formed first, undergoing slow cooling, and the remainder cooled quickly.

Working in the field, you come upon a light-colored, fine-grained igneous rock that contains some very large dark-colored crystals. How do you account for this complex mineralogy?

fine-grained

Working in the field, you see a thin, dark-colored igneous sill across the valley. Without seeing the sill up close, what texture would you expect it to possess?

Cross

________________ beds can form when wind or water transport sand and silt. These type of beds preserve the direction of the wind or water flow.

Shale

________________ is a very fine grained, clastic rock that breaks into thin pieces because the minerals are lined up in the rock.

Cementation

________________ is the precipitation of a binding material around grains in sedimentary rocks.

Compaction

________________ is the process by which soil and sediment lose pore space in response to the weight of the overlying material.

Nonclastic/chemical

________________ sedimentary rocks are composed mainly of substances precipitated from inorganic or organic processes.

Clastic

________________ sedimentary rocks are composed primarily of solid weathered clasts of preexisting rocks.

Viscosity

__________________ is a measure of material's resistance to flow.

nonflowing artesian well

a _ is located where the pressure surface is above the aquifer, but below the ground.

shield volcano

a broad, domed volcano with gently sloping sides, characteristic of the eruption of fluid, basaltic lava.

cement

a building material that is a powder made of a mixture of calcined limestone and clay

calcite

a carbonate material that reacts readily with cool, dilute hydrochloric acid to produce visible bubbles of carbon dioxide gas

geochemical reservoir

a component of the Earth system where a chemical is stored at some point in its geochemical cycle

Bathiloth

a composite of many plutons

clathrate

a compound in which molecules of one component are physically trapped within the crystal structure of another.

potholes

a deep natural underground cavity formed by the erosion of rock, especially by the action of water

placer deposits

a deposit that contains a valuable mineral that has been concentrated by mechanical action

Noncrystalline Material

a disordered arrangement of atoms

diapir

a domed rock formation in which a core of rock has moved upward to pierce the overlying strata.

Which of the following features can be used as an indicator of ice flow direction?

a drumlin

What is the correct term for a valley that has been scoured by glacial erosion and later filled with seawater?

a fjord

floodplain

a flat area about level with the top of the valley that is flooded when the stream spills over its banks, carrying with it silt and sand from the channel

competence

a flows ability to carry material of a given article size

inert gas

a gas which does not undergo chemical reactions under a set of given conditions. aka noble gas or rare gas

interglacial period

a geological interval of warmer global average temperature lasting thousands of years

ice age

a glacial episode during a past geological period

Accretion

a gradual process in which layers of a material are formed as small amounts are added over time

hot spot trace/hot spot island chain

a hotspot is a location on the Earth's surface that has experienced active volcanism for a long period of time which overtime can create a chain ex: The Hawaiian Islands where formed by such a hot spot occurring in the middle of the Pacific Plate. While the hot spot itself is fixed, the plate is moving. So, as the plate moved over the hot spot, the string of islands that make up the Hawaiian Island chain were formed.

What is the term for a glacial lake formed in a depression as the result of the burial of a large piece of ice in an outwash plain that later melted?

a kettle lake

abyssal plain

a large area of extremely flat or gently sloping ocean floor just offshore from a continent

river

a large natural stream of water flowing in channel to the sea, lake, or another such stream

Pahoehoe

a lava flow displaying the characteristic ropy appearance

Viscosity

a liquid's resistance to flow

ore

a rock that contains a large enough concentration of a mineral making it profitable to mine

igneous dike, sandstone, metamorphic rock

a sandstone contains inclusions of metamorphic rock. An igneous dike cuts both the sandstone and inclusions. List the rocks from youngest to oldest

evaporite deposits

a sedimentary rock formed of material deposited from solution by evaporation of water

sinkhole

a small, steep depression in the land surface above the cave

Plagioclase

a sodium and calcium-rich feldspar with twinning striations

Braided Stream

a stream that is divided into numerous strands weaving back and forth between elongate bars of gravel and sand due to abundant sediment that was carried through the stream during a previous flood

braided stream

a stream whose channel divides into an interlacing network of channels, which then rejoin a pattern resembling braids of hair

Precambrian

a term used to define 88% of earth's history prior to the start of the paleozoic era

what are silica tetrahedral?

a tetrahedral structure of 4 oxygens around one silica

strike slip fault

a type of fault where rocks on either side move past each other sideways with little up or down motion

Disconformity

a type of unconformity in which the sedimentary layers above and below the unconformity are parallel

Cryovolcanism

a type of volcanism that results from the eruption of magmas derived from the partial melting of ice

ore

a useful metallic mineral that can be mined at a profit

trace fossil

a worm burrow is an example of which type of fossilization?

Hardness

ability to resist scratching or abrasion

permeability

ability to transmit water

stratosphere

above the troposphere, dryer layer that extends to an altitude of 50 km

relative motion

absolute motions of plates leads to their motion relative to each other

influx

an inward flow

Karst Topography

an irregular, hilly type of terrain characterized by sinkholes, caves, and a lack of surface streams

Atoll

an island consisting of a circular coral reef surrounding a lagoon

sheeted dikes

an oceanic crust layer almost entirely composed of dikes (frozen sheet of magma)

Radon

an odorless, tasteless, very dilute radioactive gas and is a decay product of U238

Serpentinite

an oily looking green to black fine-grained rock that can be scratched easily with a knife.

Crystalline Material

an orderly arrangement of atoms

principles of superposition and later continuity

an undeformed sequence of sedimentary rocks is exposed in a large river canyon. Which two principles would be demonstrated by the rock

continental rise

an underwater feature found between the continental slope and the abyssal plain

island arcs

chains of volcanoes or coastal mountain ranges caused from subduction of the oceanic plate.

positive feedbacks

change in one component is enhanced by the changes it induces in other components

negative feedbaks

change in one component is reduced by the changes it induces in other components

Geothermal gradient

change in temp. with depth Average of 20 degrees C- 30 degrees C in the upper crust At depth of 100km temp. is between 1200 degrees C and 1400 degrees C

- black to dark-green - silicate minerals - contain iron and magnesium

characteristics of ferromagnesian silicates

chemical properties

chemical change due to a reaction with another material

mineral properties

chemical properties and physical properties

pot hole

circular pot holes can be worn into solid rock in the bed of a stream or river

metallic bond

closely packed atoms share electrons in higher energy shells, weaker than the other 2 bonds

organic

coal and oil shell are examples of what type of sedimentary rocks

A hand lens could be used to examine a(n) _____ -grained igneous rock, while a(n) _____ would be needed to examine the crystals in a fine-grained igneous rock.

coarse and microscope

Gneiss

coarse crystals (fewer micas than schist) forming coarse layering along foliation planes

Diorite

coarse-grained igneous rocks with a composition between that of granite and basalt. It usually occurs as large intrusions, dikes, and sills within continental crust.

igneous processes within Earth produce ____ ____ igneous rocks.

coarse-grained; intrusive

streak

color of a mineral or substance after it has been ground to fine powder.

Streak

color of mineral powdered form

internal heat

comes form radioactivity (mostly) but also from accretionary heat from all the meteorite that hit its surface

Arete

knife edged ridge between two valleys

lacustrine

lake deposits

Four main layers of Earth are based on physical properties and hence mechanical strength

lithosphere, asthenosphere, outer core, inner core

layers of the earth

lithosphere: made up of crust and upper mantle. (silicates) asthenosphere: plastic (silicates) mesosphere: solid (silicates) outer core: liquid (iron) inner core: solid (iron)

Lapilli

little stones- walnut sized pyroclasts (commonly called cinders) 2-64 mm

Clastic

loose rock fragments (clasts) cemented together.

Felsic

low temperature, high silica

Basaltic Lava Flow

low viscosity lava flow

Adding water can significantly _____ the temperature at which a rock can melt.

lower

optical

luster, color, streak, and crystal shape

Biotite

luster: Nonmetallic Hardness: <5.5 Cleavage: E/G Streak: gray/black/brown Color: black

Hematite

luster: either hardness: <5.5 cleavage: p/a streak: red/red-brown color: red/red-brown

Magnetite

luster: either hardness: >5.5 cleavage: p/a streak: dark gray/black color: silvery /dark gray/black

Galena

luster: metallic hardness: <5.5 cleavage: e/g streak: gray/black color: silvery gray

Pyrite

luster: metallic hardness: >5.5 cleavage: p/a streak: dark gray color: silvery gold

Muscovite

luster: nonmetallic hardness: <5.5 cleavage: e/g streak: none/white color: colorless/gray/white

Halite

luster: nonmetallic hardness: <5.5 cleavage: e/g streak: none/white color: colorless/white

Calcite

luster: nonmetallic hardness: <5.5 cleavage: e/g streak: none/white color: white/colorless

Talc

luster: nonmetallic hardness: <5.5 cleavage: p/a streak: white color: white/gray

Plagioclase Feldspar

luster: nonmetallic hardness: >5.5 cleavage: e/g streak: white/gray color: gray/white

Potassium Feldspar

luster: nonmetallic hardness: >5.5 cleavage: e/g streak: white/gray color: orange/pink/brown

Quartz

luster: nonmetallic hardness: >5.5 cleavage: p/a streak: none/white color: colorless/white/gray

pyroclastic flow

made of hot gases infused with ash and large lava fragments.

coquina

made up of Calcite/Quartz. tan/white. Coarse grained

basalt, gabbro

mafic

Basalt

mafic extrusive aphanitic

Gabbro

mafic intrusive phaneritic

Scoria/Vesicular Basalt

magic extrusive vesicular

A(n) ____ chamber is an underground body of molten rock.

magma

Conduction, convection, and radiation of heat are the ways that thermal energy can escape from ____ as it cools.

magma

earth's deep subsurface

magma cooling and undergoing crystallization to form intrusive igneous rocks

Extrusive

magma cools quickly on Earth's surface - fine grains (rhyolite)

Intrusive

magma cools slowly within existing rock- coarse grains (granite)

sill

magma that solidifies in a horizontal fracture

dike

magma that solidifies in a vertical fracture

pluton

magma that solidifies in roughly spheroidal or ellipsoidal magma chambers

plutonic

magma which loses its heat to the upper crust and solidify (igneous rocks that are generally course grained and are classified on the basis of minerals actually present in the rock) ex: gabbro, granite

Laccoliths

magma which makes a lens shape

hydrothermal deposits

minerals deposited from hot waters, usually associated with igneous intrusions

Chemical

minerals that crystallize directly from water.

solid solutions

minerals with a range of compositions between fixed end- members ex: olivine can be a pure iron end member(Fe2SiO4) or pure magnesium end member (Mg2SiO4)

polymorphs

minerals with the same composition but different crystalline structure ex: diamond and graphite are both carbon (different structure because of different conditions)

What was so odd about the ancient glaciation of the southern hemisphere?

modern glaciers form on land and move to sea while these appear to have been off the coast in the present oceans (no clear continental source)

compound

molecules made from more than one element

Magma

molten rock below surface

Lava

molten rock exposed on surface

Silicates

most abundant class of mineral in the earth's crust

Oxygen and Silicon

most common elements in crust

SiO2

most common oxide in crust

black shale

most common sedimentary rock being formed on the deep ocean floor

silicate minerals

most igneous rocks are primarily composed of:

dendritic drainage

most rivers follow the same kind of irregular branching pattern

Schist

mostly intermediate size mica crystals with some other minerals; produces thin layering along foliation planes

absolute motion

motion relative to an external reference frame

mons

mountain on a celestial body

long shore drift

moves sand parallel to the shore and builds up as sandbars, eventually returns to the oceans as rip tides

dunes

moving sand piles up as dunes

Which rock types would you expect to be deposited on top of limestone if sea level falls and then rises?

mud followed by limestone

mineraloid

naturally occurring substances that do not meat all of the criteria for minerals

subduction In Convergent

ne plate descends below another; oceanic crust is "consumed" Plates to one another - recycled back into the mantle

aybssal plains

near continents, sediment from the continents covers the hills and forms flat regions.

Electron

negatively charged particle

Ocean pH

neutral 7, lately has been slightly basic (8.1)

Neutron

neutrally charged particle

hydrothermal

relating to or denoting the action of heated water in the earth's crust.

If the pressure and bond strength are sufficient to overcome vibrations due to an increase in temperature, a rock or mineral will _____.

remain solid

Erosion

removal of sediment grains from parent rock.

Irregular pluton

resembles vertical chambers or bumpy masses

Hardness

resistance of a mineral to abrasion or scratching

talus slope

result of individual rock falls

sea floor spreading

result of the seafloor moving away from the oceanic ridges due to rising magma

Elastic deformation

reversible change in shape or volume (type of deformation)

biostratigraphic unit

sedimentary rock unit based on a particular fossil assemblage within a rock

Historical geology

seeks an understanding of the origin of Earth and its development through time

geodynamo

self sustaining process responsible for maintaining the earths magnetic field in which kinetic energy of convection motion of the earths liquid core is converted into magnetic energy

Deposition

settling out of the transporting fluid.

covalent bonding

sharing of electrons

Micas (biotite and muscovite)

sheets of tetrahedra

mantle

shell of silicate rich rock

Calcarenite

shells in them white - calcium

Raised beaches

shorelines stranded at higher elevations than the present shore and are an indication of an emergent coast

hanging valley

side valleys that have floors above the level of the main valley where they join

The primary chemical component of igneous rocks is ____, which ranges between 44% and 77%.

silica

Pegmatite

silica rich fluid magmas, major source of Nb and Ta

Felsic igneous rocks contain more ___ and are ___ in color compared to mafic igneous rocks.

silica; lighter

Main silicate minerals

silicon & oxygen. aluminum, calcium, sodium, potassium, magnesium.

Loess

silt sized particles carried by wind, build up to form thick deposits

inner core

solid metalli sphere suspended in the liquid outer core

sill

tabular igneous body that was intruded PARALLEL to the layering of preexisting rock

Dike

tabular shaped bodies that cut through surrounding rock.

Divergent boundary

tectonic plates move apart.

Convergent boundary

tectonic plates move together.

Transform boundary

tectonic plates slide sideways. Plate material is neither created nor destroyed.

terraces

tectonic uplift can result in flat, steplike surfaces in a stream or valley that line the stream above the flood plain

factors affecting viscosity

temperature, composition, dissolved gases

Cleavage

tendency of a crystal to break along flat surfaces

cleavage

tendency of some minerals to break along flat, parallel surfaces

Cleavage

tendency to break along planes of weak bonding

cleavage

tendency to break along planes of weak bonding

Cleavage

tendency to break in preferred directions (flat surfaces)

Hypothesis

tentative or untested explanation

Which landform marks the furthest extent of an advancing glacier?

terminal moraine

Which of the following is a divergent plate boundary?

the Mid-Atlantic Ridge.

capacity

the Toal sediment land carried by a flow

relative humidity

the amount of water vapor in the air, expressed as a percentage of the total amount of water the air could hold at the same temperature if it were saturated

luster

the appearance or quality of light reflected from the surface of a mineral

Drainage Basin

the area from which a single stream or river and its tributaries drains all of the water

continental shelf

the area of seabed around a large landmass where the sea is relatively shallow compared with the open ocean. The continental shelf is geologically part of the continental crust.

isotopes of the same element

the atoms have different numbers of neutrons and the same number of protons

ionic bond

the attraction of oppositely charged ions to one another

Physical Weathering

the breaking down of rock into sediment without changing its chemical composition

permeability

the capacity of a solid to allow fluids to pass through it

Chemical weathering

the chemical break down of rock into sediment and the changing chemical composition of rock. Usually common in places where there is water and warm temperatures.

Silicates

the configuration of atoms in the tetrahedron can be portrayed in different ways

carbon cycle

the continual movement of carbon between different components of the earth system

plate tectonic system

the convecting mantle and its overlying mosaic of lithosphere plates

Volcanism or cooling and Later Uplift then the cycle...

the cycle begins again

hydrologic cycle

the cyclical movement of water- from the oceans to the atmosphere by evaporation, to earths surface by precipitation to streams through runoff over and under the ground and back to the oceans

solar forcing

the cyclical variation in the input of solar energy

chemical weathering

the decomposition or dissolution of earth materials

density

the degree of compactness of a substance.

Angularity

the degree of edge or corner smoothness.

calcium carbonate compensation depth

the depth at which calcium carbonate is dissolving at a faster rate than it is being supplied

roundness

the description of the degree to which the sharp corners and points of fragmented grain have been worn away

Clast size

the diameter of fragments or grains. Range from very coarse to very fine.

Relief

the difference in elevation between the highest and lowest parts of an area

Contour Interval

the difference in elevation from one contour line to the next

weathering

the disintegration and decomposition of material at or near the surface

What is the snowline?

the elevation above which snow persists throughout the year

base level

the elevation at which it ends by entering a large standing body of water, such as lake or ocean, or another stream

valley

the entire area between the tops of slopes on both sides of the stream

Supernova

the explosion of a star that causes the star to become extremely bright

delta

the floor of the lake or ocean slopes to deeper water away from the shore, the deposited materials build up a large, flat topped- deposit

efflux

the flowing out of a particular substance or particle

albedo

the fraction of solar energy reflected by a surface

continental rise

the gently sloping surface located at the base of teh continental slope

erosion

the incorporation and transportation of material by a mobile agent, usually water, wind, or ice

recharge

the infiltration of water into any subsurface formation

Batholiths

the largest intrusive igneous bodies, form in linear groups up to 100km wide, thick Made of granite or diorite shaped like bath tubs

Regolith

the layer of unconsolidated rocky material covering bedrock.

Which is the best definition of "glacial snow line"?

the line dividing zones of accumulation and melting of ice at the surface of a glacier

Troposphere

the lowest layer of the atmosphere

Biotite

the name a dark-colored mica

point bars

the outside of banks are eroded, sediments are deposited to form curve sandbars

Biosphere

the part of Earth where life exists

What is the zone of wastage?

the part of a glacier where snow melting exceeds snow accumulation

fossil range

the period of time when an organism first and last appears in the sedimentary record

saturated zone

the pores are completely filled with water

U.S Public Land Survey System

the primary way that land is subdivided in the US by using a grid system based on the 4 cardinal directions

fossil succession

the principle of _ states that organisms succeed one another in a definite, determinable order that can be used to recognize a specific time.

Law of Inclusion

the principle that the bits of rock and other sediment found in rocks must be older than the rock they are found in because they had to exist before they could be made into the new rock

Principle of uniformitarianism

the processes we see in action on Earth today have worked in much the same way throughout the geologic past

Aquafier

units or zones of rock under the surface that are able to hold and transport water

why are the boundaries between rock types not absolute boundaries?

unlike minerals it does not have specific compositions and internal structures, in many cases there is a continuous gradation from one rock type to the next or from one group to the next

absolute dating

uses known half-lives of isotopes more accurately date rock samples.

metallic bond

valence electrons are free to migrate from one to another. The mobile valence electrons serve as the electrical glue.

geodesy

very old branch of earth science that studies Earth's shape and surface

caldera

volcanic depressions generally greater than 1 kn in diameter that form from collapse triggered by the removal of magma chambers below the caldera

crater

volcanic depressions generally less than 1 kn in diameter that form from explosive eruptions

Lahar

volcanic mudflow

Igneous Rock

volcanic or putonic

when the amount of water flowing toward the well equals the amount of water being pumped out of the well

when will a cone of depression stop enlarging?

Angular Unconformity

where horizontally parallel strata of sedimentary rock are deposited on tilted and eroded layers, producing an angular discordance with the overlying horizontal layers

folded sedimentary layers were originally laid down flat and later deformed

which of the following describes the principle of original horizontality?

alpha particle emission, beta particle emission, electron capture

which of the following includes all common types of radioactive decay?

erosive surface

which of the following is a common feature that all unconformities exhibit?

younger sedimentary strata overlie uplifted and weathered igneous or metamorphic rocks

which of the following is an accurate description of a nonconformity?

a stream running across an irregular surface

which of the following is associated with an erosive surface

groundwater moves over large distances, over longer timescales

which of the following is true regarding groundwater as you move deeper below the surface?

sedimentary rocks

which of the following rock types is most abundant on earth's land surface?

more daughter products accumulate over time

which of the following statements regarding radioactive decay is true?

scallop

which organism from the video is the least useful for relative dating

the rocks formed at great depth below the surface

while working in the field, you discover an outcrop of metamorphic rocks. What can you conclude from this observation?

physical properties

without changing its composition (color,luster,clarity)

eustatic sea level

worldwide sea level

Does the study of physical geology precede earth history?

yes

continental margin

zone of transition between continent and ocean basin

humus

an important component of most of earths soils

Pumice

felsic intermediate extrusive vesicular

How did the Himalayas form?

Collision between India and Eurasia

residence time

The average time a given particle will stay in a given system

What is the best way to describe the shape of a glacial valley?

U-shaped

Ignimbrites

What are rocks formed when deposits of pyroclastic flows solidify?

Physical (mechanical)

breaking of rocks into smaller pieces (disintegration)

hypabyssal

igneous rock that shares characteristics of both plutonic and volcanic

Leachate

polluted liquid produced by water passing through buried wastes in a landfill

Environmental Geology

refers to geology as it relates directly to human activities

earth's shallow subsurface

sediment undergoing lithification

lithification

sedimentary rock

Feldspars and Quartz

three dimensional frameworks

Aquiclude

units in which the flow of water is greatly prohibited

Aquitard

units in which there is little or no water flow

Basalt

-Small minerals -Rich in dark minerals -Rapid cooling

Pyroclastic

"fire fragments"

Nuée ardent

"glowing cloud"

Cinders

"pea-sized" 2-64 mm

NIMBY

"refers to the idea that, while people may be aware of the necessity of some unpleasant realities, such as prisons, landfills, or chemical plants, they insist theses place be located away from where they live"- NOT IN MY BACK YARD

S wave

"shaking" particle motion at right angles to the direction of wave travel

Lapilli

"walnut" size 2-64 mm

Crust

(Chemical) Outer layer of Earth Oceanic and Continental crust

hematite

(Fe2o3) All iron oxides formed at earths surface which is also the most abundant

how are shield volcanoes, composite volcanoes and cinder cones different?

*Shield volcanoes: -largest volcanoes -thick sequence of thick lava flows -low slopes -life span of 100,000-1,000,00 yrs -smal summit calderas common at vent -low viscosity magmas -intense fountaning vent, but rarely explosive composite: -inter bedded lavas and frag mental material -alternating lava and pyroclastic eruptions or eruptions of blocky flows -intermediate viscosity flows -steep slope -life span 10,000-100,000 -sometimes explosive -classic hollywood volcano cinder cones: -small volcanic landforms -generally single eruptive events 1-10 yrs -loose fragmental material -steep angle -lava flows from base common -common in areas of crustal extension

True

*T/F:* A factor that influences the chemical composition of magmas is mixing of magmas brought together from different locations.

True

*T/F:* A factor that influences the chemical composition of magmas is only partial melting of the source rock.

True

*T/F:* Anything that can be aphanytic can be porphyritic.

True

*T/F:* As magma cools, the feldspar will become less calcium rich and become more sodium rich.

True; Erosion of soft exterior rocks has exposed the frozen lava that filled the vents at Devil's Tower and Shiprock.

*T/F:* Devil's Tower, Wyoming, and Shiprock, New Mexico, are landforms that exist because softer volcano exteriors erode faster than solidified lava in fissures and vents.

True

*T/F:* Factors that influence the chemical composition of magmas may include the chemical composition of the source rock.

False; Felsic magma is more viscous because the silicon tetrahedrons link up in chains, which at the microscopic level tangle and impede smooth flow.

*T/F:* Felsic magma is less viscous than mafic magma.

False; Igneous rocks are aphanitic if they're fine-grained, phaneritic if they're coarse-grained.

*T/F:* Igneous rocks are coarse-grained if they're intrusive.

False; They're called pyroclastic rocks

*T/F:* Igneous rocks formed of igneous debris blown out of a volcano are called pegmatites.

True

*T/F:* Intermediate rocks are often called "salt and pepper" rocks.

True

*T/F:* Intrusions are bodies of rock that have never been erupted.

True

*T/F:* Intrusions are classified by size.

True; Volcanic rocks, like basalt, andesite, and rhyolite, are fine-grained extrusive igneous rocks. Intrusive igneous rocks do solidify in the Earth but eventually are exposed by erosion.

*T/F:* Intrusive igneous rocks cool slowly and are coarse-grained.

False; Lava often travels no faster than several feet per hour, and most flows move no faster than about 30 km (18 mph); people can usually get out of the way.

*T/F:* Lava is the greatest volcanic hazard to human life because it travels so fast.

False; The rocks formed of mafic minerals would be basalt and gabbro.

*T/F:* Mafic minerals form rhyolite and granite.

False; The hotter the magma, the less viscous it is and the faster it flows.

*T/F:* Magma moves up toward Earth's surface more quickly as it cools and therefore becomes less viscous.

True

*T/F:* Magmatic rocks are classified according to their silica content.

True

*T/F:* Obsidian appears to be black, but it actually translucent or smoky.

True

*T/F:* Olivine and quartz are never found in the same rocks.

False;

*T/F:* Pegmatite has a very glassy texture.

False; Pegmatite is a very coarse-grained rock (which means it has very large crystals); glassy means no crystalline structure.

*T/F:* Pegmatite has a very glassy texture.

False; Pegmatites have cooled quickly but are, surprisingly, very coarse-grained because they form in water-rich melts that allow atoms to move around quickly and develop large crystals.

*T/F:* Pegmatites have intruded at great depth and cooled very slowly.

False; Since it's on the left side of the solidus line, it is solid. The region to the right of the liquidus line represents molten rock. Between the two lines, the rock is a mixture of solid and melt.

*T/F:* Point A represents rock that's physical state is molten.

True; Pyroclastic flows move extremely fast (100 to 300 km/h) and are very hot (500 to 1000°C). No person, animal, or plant could survive if caught in the path of a pyroclastic flow.

*T/F:* Pyroclastic flows bring instant death to any life caught in them.

True; Earth's temperature increases with depth, so the deeper an intrusion is, the hotter its environment and the longer it takes for it to cool.

*T/F:* The deeper an igneous intrusion, the slower it cools.

False; fractional crystallization

*T/F:* The sequence of mineral production that takes place in a cooling magma, called Bowen's reaction series, is an example of the process called stoping.

True

*T/F:* There is a well ordered sequence to fractional crystalization and it always happens in the same sequence.

True; Tuff is composed of fine pieces (volcanic ash); breccia is composed of larger, angular pieces.

*T/F:* Tuff and breccia are both fragmental igneous rocks.

True

*T/F:* Volcanic ash deposits are often Rhyolite.

True; The presence of volatiles helps break chemical bonds, resulting in a lower melting temperature for the wet rock.

*T/F:* Wet igneous rock (rock that contains volatiles) melts at a lower temperature than does the dry version of that same rock.

True

*T/F:* You cannot identify individual crystals in an extrusive rock.

Calderas

-Steep-walled depressions at the summit -Size generally exceeds 1 km in diameter

What does features of the ocean floor include?

- Continental margins are the portion of the seafloor adjacent to major landmasses • The continental shelf is a gently sloping region of continental crust extending from the shore • The continental slope is a relatively steep dropoff that extends from the continental shelf to the deep ocean floor • The continental rise consists of a thick wedge of sediment that moved downward from the continental shelf and slope to accumulate on the sea-floor - Deep ocean basins are the portions of the seafloor between the continental margins and the oceanic ridges • The abyssal plain is a flat feature of the deep ocean basin • Deep-ocean trenches are deep and relatively narrow depressions that make up only a small portion of the ocean floor • Seamounts are small volcanic structures that dot the ocean floor - Oceanic ridges are the most prominent feature on the ocean floor and are composed of igneous rock that has been fractured and uplifted

Types of intrusive igneous features

- Dike: a tabular, discordant pluton - Sill: a tabular, concordant pluton (e.g., Palisades Sill in New York) - Laccolith

Main Components of Magma

- Melt - Crystallized Minerals - Volatiles

What do features of continents include?

- Mountain belts are the most prominent features of continents - Cratons are the stable interior of the continents - Shields are expansive, flat regions of deformed crystalline rocks in the cratons - Stable platforms are the flat portions of cratons covered with a thin veneer of sedimentary rocks

Mineral

- Naturally Occurring - Inorganic - Solid - Definite Chemical Composition - Definite Crystalline Structure

8 Elements that Form Common Rock Forming Minerals

- Oxygen - Silicon - Aluminum - Iron - Calcium - Sodium - Potassium - Magnesium

What did the oceanographer's learned after WW II?

- The oceanic ridge system winds through all of the major oceans - There is no oceanic crust older than 180 million years old - Sediment accumulation in the deep oceans was relatively minor • These developments led to the theory of plate tectonics

Metallic bonding

- each atoms contributes electrons - electrons are free to move about the lattice - positively charged ions and the moving "sea" of electrons

Iron Production

- iron is the chief element of all heavy industry and of land or sea transport - steam engine improves iron production and increases demand for iron -iron was not popular bc it was relatively weak - demand for iron was limited - BUT the use of coke (derived from coal) and the steam engine made making iron easier, thus the price dropped

Cleavage directions

- one direction - two directions at 90 degrees - two directions not at 90 degrees - three directions at 90 degrees - three directions not at 90 degrees - four directions

What are the basic steps used in the Scientific Method?

-- A question is raised about the natural world - Scientific data are collected - One or more hypotheses are developed - Experiments are developed to test the hypotheses - Hypotheses are accepted, modified, or rejected - Data and results are shared with the scientific community

ice core records

-Can construct a climatic record over the age range of the core through isotopic analysis

Hot Spot

-Caused by rising plumes of mantle material Example- Hawaiian islands

silica

-Compound containing only silicon and oxygen in 1:2 ratio -Silicon dioxide (SiO2), appearing either as a relatively pure form in a mineral (e.g., quartz) or as a component in more chemically complex minerals and rocks

Alfred Wegener

-First proposed hypothesis, 1915 -Published The Origin of Continents and Oceans

Evidence about Pangaea used by Wegener

-Fit of South America and Africa -Fossils match across the seas -Rock types and structures match -Ancient climates

Which of the following statements characterize the activity of glaciers and their impact on the landscape?

-Glaciers are capable of moving large amounts of sediment. -Glaciers are capable of oversteepening slopes. -Glaciers can disrupt the hydrologic cycle -Glacial activity can change the position of sea level relative to present conditions (All of the above)

Felsic

-High-silica content -Acid type magma -Thick and viscous -Slow moving -Light color minerals form such as feldspar and quartz -Example: granite/rhyolite -Nonferromagnesian minerals -Mostly intrusive and continental rock

Mantle plume

-Hot mantle materials that ascend from the mantle Example- Yellow Stone

Granite

-Large minerals -Light colored -Slow cooling

Mafic (Magnesium & Ferric)

-Low-silica content -Basic type magma -Hotter and more fluid -Fast moving -Dark color minerals form that are high in calcium (Ca), iron (Fe), and magnesium (Mg) so dark color rocks form -Ferromagnesian minerals -Mostly extrusive rock and the mantle

Differences between Oceanic and Continental Crusts

-Oceanic is denser -Oceanic started from seafloor spreading -Continental is thicker -Continental is older

General characteristics of magma

-Parent material of igneous rocks -Forms from partial melting of rocks inside Earth -Magma that reaches the surface is called lava

General characteristics of magma

-Rocks formed from lava at the surface are classified as extrusive, or volcanic rocks -Rocks formed from magma that crystallizes at depth are termed intrusive, or plutonic rocks

What drives plate motion

-Slap-Pull -Ridge-Push Force -Mantel Convertion

what are the 4 major subdivisions of rock type?

1. sedimentary- formed at or near the earths surface and solidify during shallow burial at low temps 2. igneous-formed at high temp from molten rock called magma 3. metamorphic- formed when solid rocks are recrystallized as a result of being reheated and compressed at high temps and pressure 4. extraterrestrial- meteorites

what factors control the development of metamorphism?

1. temp 2. pressure (depth of burial) 3. rock composition 4. fluids (b/c crystallize better with fluids) 5. time (b/c longer cooking= more change ie better)

The steps of the Scientific Method

1.State the problem 2.Hypothesis 3.Design the experiment 4.Record & Analyze the data 5.Conclusion

What are the major differences between the inner and outer planets?

1.density: The inner planets have densities between 4.0-5.5 gms The giant outer planets have densities between 0.7-1.7 gms 2. Composition: inner- Fe, O, Si, Mg Outer- H, He, CH4, NH3, H2O

On average, Earth's lithosphere is approximately ____ km thick.

100

When was the last time North America had major ice sheets?

18,000 years ago

What percentage of solar radiation is reflected back into outer space by the albedo of the Earth?

30%

continental crust

35-70 km thick. waves are travelling less than 6.2 km/sec

clastic, biochemical, organic, chemical

4 classes of sedimentary rocks

how is heat transferred through earth?

4 mechanisms 1. radiation- the transfer of energy as electromagnetic waves 2.. conduction- transfer of energy bu atom to atom or molecule to molecule 3. convection- process in which material expand s rises loses heat and sinks 4. advection- transfer of heat by moving liquids or solids

Process of how an igneous rock forms. First step at the bottom and the last step on top:

4. Magma may reach the surface and erupt as lava 3. Accumulated magma could solidify in chambers or continue upward 2. Magma rises and some accumulates in pockets 1. Partial melting of rock in the deeper parts of the crust or mantle forms magma

How old is Earth estimated to be?

4.6 Billion years old

fracture

A break or crack in a rock, subdivided into joints and faults

Match the type of glacier with the correct definition. Piedmont glacier.

A broad lobe that exits a mountain valley to flow on an open plain.

stalacite

A calcite deposit that hangs from the roof of a cave

Rhyolite

A coarse-grained granite is most similar in mineral composition to what fine-grained rock type?

granite

A coarse-grained, felsic igneous rock containing mostly feldspar and quartz

stratigraphic section

A columnar diagram that shows the sequence of rock units, generally in their approximate relative thicknesses

scoria

A dark gray, black, or reddish volcanic rock that contains abundant vesicles, usually having the composition of basalt or andesite; syn. volcanic cinders

How does isostatic rebound affect a glacial landscape?

A depressed crust will rise after glacial retreat

clay

A family or minerals or any fine sedimentary particles less than .002 millimeters

pyroclastic flow

A fast-moving cloud of hot volcanic gases, ash, pumice, and rock fragments that generally travel down the flanks of a volcano; syn. ash flow.

fault creep

A few sections of the San Andreas Fault exhibit a slow, gradual displacement known as_.

basalt

A fine-grained, dark-colored mafic igneous rock, with or without vesicles and phenocrysts of pyroxene, olivine, or feldspar

resisting forces

A force that resists the motion of an object, such as resisting the movement of tectonic plates

island arcs

A generally curved belt of volcanic islands above a subduction zone; also used as an adjective to refer to this setting

What is a pluvial lake?

A lake that fills due to increased precipitation in a cooler, wetter climate

Sinkholes

A large surface crater caused by the collapse of an underground channel or cavern; often triggered by groundwater withdrawal.

folded mountain belt

A long, linear zone of Earth's crust where rocks have been intensely deformed by horizontal stresses and generally intruded by igneous rocks.The great folded mountains of the world (such as the Appalachians, the Himalayas, the Rockies, and the Alps) are believed to have been formed at convergent plate margins.

ocean trenches

A long, narrow, deep depression in the ocean floor, typically one running parallel to a plate boundary and marking a subduction zoneOne of earth's large features, the result of plate tectonics.

Hardness

A measure of the resistance of a mineral to abrasion or scratching Mohs hardness scale

gabbro

A medium- to coarse-grained mafic igneous rock, the phaneritic equivalent of basalt.

vein deposit

A metal-rich accumulation of mineral matter that occurs along a fracture or bedding plane

rhyolite

A mostly fine-grained, felsic igneous rock, generally of volcanic origin; can contain glass, volcanic ash, pieces of pumice, and variable amounts of visible crystals (phenocrysts)

volcanic glass

A natural glass produced by the cooling and solidification of molten lava at a rate too rapid to permit crystallization.

Springs

A natural source of water formed when water from an aquifer percolates up to the ground surface.

Breeder reactor

A nuclear power plant that creates its own fuel from plutonium

What is the D" layer?

A partially molten layer above the outer core at the base of the mantle.

nucleus

A particle composed of protons and neutrons in the core of an atom.

convergent boundary

A plate boundary where two plates move toward each other.

divergent boundary

A plate tectonic boundary in which two plates move apart (diverge) relative to one another

convergent boundary

A plate tectonic boundary in which two plates move toward (converge) relative to one another

Intermittent Stream

A river has water flowing in it only during certain times of the year.

neutron

A subatomic particle that contributes mass to a nucleus and is electrically neutral.

seamounts

A submarine mountain, in some cases flat-topped, that rises above the seafloor

sill

A tabular igneous intrusion that parallels layers or other planar structures of the surrounding rock and which usually has a subhorizontal orientation.

composite volcano

A tall, cone-shaped mountain in which layers of lava alternate with layers of ash and other volcanic materials

element

A type of atom that has a specific number of protons and chemical characteristics

normal fault

A type of fault where the hanging wall slides downward; caused by tension in the crust

joule

A unit used to measure energy and work.

Gabbro

A usually dark, coarse-grained igneous rock composed mostly of plagioclase feldspar and clinopyroxene, and sometimes olivine.

Pumice

A usually light-colored, porous, lightweight rock of volcanic origin. The pores form when water vapor and gases escape from the lava during its quick solidification into rock.

Batholith

A very large pluton that covers more than 100 km2 is called a __________________.

volcanic breccia

A volcanic rock containing angular fragments in a matrix of finer material

groin

A wall made of rocks or concrete that is built outward from a beach to reduce erosion

Artesian Wall

A well in which ground water rises on its own under pressure in an aquifer

________ destroyed the city of St. Pierre, Martinique in 1902.

A. A nuee ardente (pyroclastic flow)

________ has the same mineral composition as andesite.

A. Diorite

________ is characterized by very coarse mineral grains?

A. Pegmatite

________ is the dominant feldspar in basalt.

A. Plagioclase

Mount St. Helens is ________.

A. an explosive stratovolcano

Which kind of eruptive activity is most likely to be highly explosive?

A. eruptions of large composite cones (stratovolcanoes)

The last minerals to crystallize on Bowen's Reaction Series are those found in igneous rocks with a ________ composition.

A. felsic

A cubic centimeter of quartz, olivine, and gold weigh 2.5, 3.0, and 19.8 grams respectively. This indicates that ________.

A. gold has a higher density and specific gravity than quartz and olivine

Visible quartz and potassium feldspar grains are the main constituents in a ________.

A. granite

Which of the following minerals is in the mineral group known as mica?

A. muscovite

Which of the following igneous rocks has the lowest silica (SiO2) content?

A. peridotite

A ________ volcano is a very large, gently sloping mound composed mainly of basaltic lava flows.

A. shield

A ________ is an open cavity in a volcanic rock that was filled by a gas bubble when the lava was still mainly liquid.

A. vesicle

Which of the following is not part of the Milankovich Cycle?

Accretion

earthquake mitigation

Adjustments to earthquake activities: Site selection for critical facilities Structure reinforcement and protection Land-use regulation and planning Emergency planning and management: Insurance and relief measures

Give an example of a divergent plate:

African and South-American called Mid-Atlantic Ridge

Who proposed the theory of continental drift?

Alfred Wegener

Biosphere

All life on earth, near the surface from ocean floor to the atmosphere. Plants and animals.

Biosphere

All living or once-living materials

Plate boundaries

All major interactions among plates occur along their boundaries

Amphibolite

Amphibole/Biotite/Garnet Schist Intermediate Metamorphic rock, forms in the inner core of collisional mountain belts, Intermediate-high P&T

disconformity

An _ exhibits sedimentary layers that are parallel to each other above and below an erosive surface.

isotope

An atom that has more or fewer neutrons that it should

7

An atom's mass number is 13 and its atomic number is 6. How many neutrons are in its nucleus?

isotope

An element with the same number of protons, but a different number of neutrons

granite or felsic rocks

An igneous rock that contains quartz and potassium feldspar would have a mineralogic content placing it in the range of __________.

aphantitic

An igneous rock that does not contain crystals visible to the unaided eye; can consist of microscopic crystals, fine-grained volcanic ash, volcanic glass, or a combination of these

fissure eruption

An eruption in which lava is extruded from narrow fractures or cracks in the crust.

Granite

An example of a coarse-grained igneous ROCK composed mostly of feldspar and quartz is called __________________.

Rhyolite

An example of a fine-grained igneous ROCK composed mostly of felspar and quartz is called __________________.

hypothesis

An explanation that is developed to explain observations and that allows testing

first, the limestone was laid down, then intruded by the igneous dike, and lastly the sandstone was deposited

An igneous dike cuts through limestone, but not through the overlying sandstone. Which of the following statements is most accurate?

metamorphic and sedimentary

An igneous rock becomes buried, is subject to high heat and pressure, and recrystallizes. This rock then is eroded, transported, deposited and subsequently lithified. Which rock types—in order—did the original igneous rock develop into?

Porphyritic

An igneous rock composed of two distinctly different sizes of mineral crystals with a fine-grained matrix around larger crystals is said to have a(n) __________________ texture.

phaneritic

An igneous rock containing crystals that are visible to the unaided eye

pegmatite

An igneous rock containing very large crystals, which may be centimeters to meters long

dimension stone

An intact block of granite or marble to be used for architectural purposes.

Obsidian

Any extrusive glassy

Rock

Any solid mass of minerals or mineral like matter that occurs naturally as part of our planet.

Rock

Any solid mass of minerals or mineral like matter that occurs naturally as part of your planet.

Shields

Are expansive, flat regions of deformed crystalline rocks in the cratons

Seismograms

Are records of seismic waves

Stable platforms

Are the flat portions of cratons covered with a thin veneer of sedimentary rocks

Cratons

Are the stable interior of the continents

Surface area

As ___ ___ increases on a rock, the rate of weathering increases

Baslat

As lava cools, it most often hardens in dark basalt. This common rock covers thousands of square miles of the Earth's surface

assimilation

As magma migrates through the crust, it may incorporate some of the surrounding host rock.

are able to transmit water great distances from recharge to discharge areas

As shown by the South Dakota example, artesian systems_/

The ion at the center of a silicate tetrahedron is surrounded by ________.

B. 4 oxygen ions

________ magma is erupted at oceanic spreading centers (mid-ocean ridges).

B. Basaltic

Which set of magma conditions produces the most explosive eruptions?

B. High viscosity and dissolved gas

________ is a volcanic rock that is extremely vesicular and glassy.

B. Pumice

Which of the following igneous rocks exhibit aphanitic (fine-grained) texture?

B. andesite, rhyolite

Which of the following describes the light reflecting and transmission characteristics of a mineral?

B. luster

Why do magmas rise toward Earth's surface?

B. magmas are mainly liquid and contain dissolved fluids such as water; most are less dense than the adjacent solid rock

A(n) ________ texture would be most unlikely to occur in an extrusive igneous rock.

B. phaneritic

Which mineral is composed of silicon dioxide (Si02)?

B. quartz

All silicate minerals contain which two elements?

B. silicon, oxygen

Which part of a glacier is responsible for abrasion and plucking?

Basal sliding zone

pyroxene and calcium-rich plagioclase feldspar

Basalt is an igneous rock that can be identified by its small crystals. What are they composed of?

pyroxene and calcium-rich plagioclase feldspar.

Basaltic igneous rocks contain which of the following minerals:

pyroclastic material

Based on the evidence in the Eruption of Shiveluch Volcano folder, which of the following terms associated with volcanism best describes the grey plume emanating from the volcano?

Because batholiths form deep within Earth, the occurrence of one at the surface implies that it has since been uplifted and/or the rocks above have been removed.

Batholiths are known to form the cores of mountain ranges such as the Sierra Nevada. What is the implication of this observation?

How do we know that the age of the oceanic rock, from the mid-oceanic ridge spreading center, gets older?

Because as new seafloor rises it pushes the older seafloor outward towards the continents and each time new seafloor rises the direction of the lava flow changes from the magnetization of the Earth. So the oceanic rocks cool in different directions each time the sea floor spreads.

How do we know the age of the oceanic rock gets older towards the continents?

Because the older the oceanic rock is, it becomes cooler and more dense

Intrusive

Beneath earths surface - when magma is forced up to the surface but doesn't reach all the way. It intrudes into the crust and solidifies - often later become exposed

A ________ is an intrusive, igneous rock body that is tabular and concordant (parallel to adjacent sedimentary rocks).

C. sill

Lava flows are typically finer grained than intrusive igneous rocks. Why?

C. the extrusive magma cools quickly so the mineral grains do not have time to grow

Shield

Broad, dome shape produced by accumulation of low viscosity basaltic lavas

The majority of the Earth's subduction zones are found in and around the ________ Ocean basin.

C. Pacific

Which of the following will react readily with acids such as hydrochloric?

C. calcite

What mineral is the hardest known substance in nature?

C. diamond

Hornblende and the other amphiboles have what type of silicate structure?

C. double chains

Which of the following minerals is a silicate?

C. muscovite

Which of the following minerals crystallize early in Bowen's reaction series?

C. olivine

What element is the most abundant in the Earth's crust by weight?

C. oxygen

Which group of minerals are the most abundant in the Earth's crust?

C. silicates

Richter scale (EQ magnitude)

Calculated from the amplitude of the largest seismic wave recorded from the earthquake, no matter what type of was was the strongest Logarithmic scale of 1 to 9

Alfred Wegner

Came up with Continental Drift hypothesis.

____________, a popular natural philosophy of the 17th and early 18th centuries, was based on a firm belief in a very short geologic history for Earth.

Catastrophism

Hot spots and plumes

Caused by rising plumes of mantle material Volcanoes can form over them (Hawaiian island chain) Mantle plumes

Catastrophism

Changes in the earth's crust during geological history have resulted chiefly from sudden violent and unusual events.

ionic bond

Chemical bond formed because of the attraction between two oppositely charged ions, such as by the loaning of one or more electrons from one ion to another

The layers of Earth are based on what two sets of characteristics?

Chemical composition and physical properties

Greenschist

Chlorite-rich schist, Low grade metamorphic rock, forms in the outer parts of collisional mountain belt, low-intermediate P&T

Cinder cone, shield volcano, composite cone

Cinder cone volcanoes are built from ejected lava fragments that take on the appearance of cinders, made from gas rich basaltic magma. Shield volcanos are volcanoes produced by fluid basaltic lavas that have a broad and slightly domed shape that looks like a shield from deep ocean floor. Composite cones are the prettiest and most dangerous has gas rich andesitic magma.

Alluvium

Clay or silt or gravel carried by rushing streams and deposited where the stream slows down

fossil fuels

Coal, oil, natural gas, and other fuels that are ancient remains of plants and animals.

conglomerate

Coarse grained, Poorly Sorted, Gravel and pebbles. Tan/orange/black

Quartz Hornblende Feldspar

Common silicate minerals in granite

Specific Gravity

Compares the weight of a mineral to the weight of an equal volume of water

Match the type of atomic bond with the correct definition. Ionic Bond

Complete transfer of electrons between atoms

Basalitic composition

Composed of dark silicates and calcium-rich feldspar

Factors determining the violence or explosiveness of a volcanic eruption

Composition of the magma Temperature of the magma Dissolved gases in the magma

Primary waves

Compressional waves Vibrations parallel to the direction of wave path Go through liquid

The Difference between Concordant and discordant

Concordant if they form parallel to existing features like sedimentary strata. Discordant is plutons if they cut across existing structures.

Cinder Cone

Cone shaped created by accumulation of ejected lave fragments

Igneous rocks

Cooling and solidification of magma (molten rock)

Big Bang Theory

Cosmological model that explains the sudden development of the universe through expansion from a hot, dense state.

Fusion

Creation of energy by joining the nuclei of two hydrogen atoms to form helium.

The ____________ is the thinnest layer of the Earth.

Crust

What are earth's 3 layers by composition?

Crust- thin, rocky outer skin, divided into: Oceanic crust- composed of basalt continental crust- composed primarily of granodiorite Mantle- composed of peridotite Core- composed of iron-nickle alloy

The Mohorovicic discontinuity coincides with the __________ boundary.

Crust-mantle

The lithosphere is composed of material from the ________ and the rigid part of the ________.

Crust; Upper Mantle

phenocryst

Crystals in an igneous rock that are larger than those around them, as in a porphyritic rock

________ is composed mainly of ferromagnesian minerals.

D. Peridotite

________ are the most abundant gases emitted by volcanoes.

D. Water vapor and carbon dioxide

The average composition of rocks comprising a large composite cone or stratovolcano is similar to a (an) ________ magma.

D. andesitic

Which of the following best describes seamounts and islands of the deep ocean basins?

D. piles of basaltic lava flows built up from the ocean floor by multiple, summit and flank eruptions

The sizes, shapes, and arrangements of mineral grains in an igneous rock are known as ________.

D. texture

Which of the following volcanoes are associated with hot spots?

D. the volcanoes of Hawaii and geysers in Yellowstone National Park

Which one of the following is not true for minerals?

D. they can be a liquid, solid, or glass

quantitative data

Data that are numeric and typically visualized and analyzed using data tables, calculations, equations, and graphs

qualitative data

Data that include descriptive words, labels, sketches, or other images

Morphology of a Volcano

Different viscosities produce different shapes of volcanos

Bowen's reaction series

During crystallization, the composition of the liquid portion of the magma continually changes

Hydrosphere

Dynamic mass of continually moving liquid. Ocean is 71% of the earths surface.

continental crust

Earth's crust that is beneath the continents and the continental shelves; average granitic composition, but includes diverse types of material

Catastrophism

Earth's landscapes were shaped primarily by catastrophes

Magnetic reversals of Earth's magnetic field are when...

Earth's north and south poles flip

Hydrosphere Atmosphere Biosphere Geosphere

Earth's spheres

lithosphere

Earth's upper, rigid layer composed of the crust and uppermost mantle

seismic waves

Earthquake occurs when geologic forces causes brittle rocks to fracture sending out vibrations like the cracking of ice on a river

Core

Earths center, mainly iron and nickel, alloy with some oxygen, silicon and sulfur. Has extreme pressure, very dense. (Like molten cannon ball in middle of earth)

Where is it occurring today?

East African Rift

ENSO

El nino-Southern Oscillation aka EL NINO

Most basaltic magmas are believed to form by partial melting of granite in the lower crust and upper mantle.

False

Oxygen

Element is the most abundant in Earth's crust by weight

protons

Elements are determined based on the number of ________________ they have.

Remobilization

Elements in pre-existing minerals can diffuse, dissolve, or partially melt and be recombined to form new mineral crystals elsewhere

What is the category name for the largest division of time used on the geologic time scale?

Eon

Asthenosphere

Exists beneath the lithosphere Hotter and weaker than the lithosphere Allows for motion of the lithosphere

Big Bang Theory

Explosion that sent all matter of the universe flying outward. First elements were hydrogen and helium. Billions of years ago debris began to cool and condense into bodies (galaxies, stars, planets)

The Difference between Extrusive and intrusive rocks

Extrusive rocks are volcanic rocks- igneous rocks that form when molten rock solidifies at the surface. Intrusive rocks are Plutonic rocks- magma that loses mobility before reaching the surface and has crystallized at depth intrusive rocks cool slowly.

A scientific theory is a tentative or untested explanation that is proposed to explain scientific observations.

False

Basaltic lavas are generally hotter and more viscous than andesitic lavas.

False

Igneous rocks are produced largely by the deposition and consolidation of surface materials like sand and mud.

False

Andesite

Fine grained (aphanitic)

Phyllite

Fine grained, folliated, aluminous, slate with more pressure, Metamorphic

Shale

Fine-grained, well-sorted, smooth, black, fine layering

What is the source of black carbon aerosols?

Fires

Alfred Wegener

First proposed continental drift hypothesis in 1915 Published The Origin of Continents and Oceans

Calcite

Fizzes

laminar flow

Flows in parallel lines in a smooth progression

Gneiss

Foliated and layered, aluminous, schist with more pressure, Metamorphic

Slate

Foliated, fine grained, aluminous, made of slate, Metamorphic

Schist

Foliated, medium grained, aluminous, can start to see layers, phyllite with more pressure, Metamorphic

how does foliation form?

Foliation is usually formed by the preferred orientation of minerals within a rock. also occurs because the rock has inequant mineral crystals that are parallel, or bc the rock has alternating dark and light colored layers

deformation

Following the deposition of a sequence of sedimentary rocks, which event is the first to occur to produce an angular unconformity?

sedimentary rocks

Form on earth's surface, mostly from loose sediment that is deposited by moving water, air, or ice

chemical bonding

Formation of a compound by combining two or more elements

Pre-existing rocks undergo metamorphism when they are subjected to heat and pressure without melting

Formation of metamorphic rocks

silicon- oxygen tetrahedron

Four smaller oxygen ions surrounding a smaller silicon ion

short term earthquake predictions

Frequency and distribution pattern of foreshocks Deformation of the ground surface: Tilting, elevation changes Emission of radon gas Seismic gap Fault that hasn't broken in awhile Abnormal animal activities

Physical/mechanical

Frost wedging is a type of ________________ weathering.

Cryosphere

Frozen regions of Earth (ice, snow)

Eclogite

Garnet/Pyroxene Gneiss Ultra High-Pressure Metamorphic

Atmosphere

Gases that envelop the Earth

Scientific Method

General procedure for discovering how the universe works through systematic observations and experiments

Frank Taylor

Geologist known for hypothesis on Continental Drift

extrusion

Geometries with equal cross section formed by very high continuous throughput by extrusion

igneous activity has occured more recently in the area

Geysers are more common in the western United states because_

Obsidian

Glassy

Blueschist

Glaucophane schist Low temperature/High pressure Metamorphic rock, forms in subduction zones, high P low T

Migmatite

Gneiss with pods of or bands of igneous material indicating partial melting

micrite

Grain Size: Silt (Extremely Fine) Components: Chemical/Biogenic Minerals/Rock Fragments present (Approximate %): Calcite Rock History: Commonly grayish, but may be white, yellow, or pink; vigorously reacts with acid

Intrusive rock Slowly

Granite is an... Cools...

Igneous

Granite, Basalt are examples of what type of rock

Systems

Group of interacting and independent parts that form a complex whole. Ex. the solid earth, atmosphere and biosphere forming our earth.

What are the two most important driving forces of metamorphism?

High heat and pressure

High Grade

High temperature and pressure

What are the basic differences between the disciplines of physical and historical geology?

Historical geology involves the study of rock strata, fossils, and geologic events, utilizing the geologic time scale as a reference; physical geology includes the study of how rocks form and of how erosion shapes the land surface.

geology

Identifies the branch of Earth science that studies all aspects of the planet

In which of the following subsystems is Earth's magnetic field generated?

Hydrologic system.

Chemical

Hydrolysis is a type of ________________ weathering.

What are Earth's 4 spheres?

Hydrosphere- water portion Geosphere- solid earth Atmosphere- gaseous envelope Biosphere- all plant and animal life

A scientific __________ aims to predict the complex behavior of Earth systems.

Hypothesis

What is the difference between Theory and Hypothesis?

Hypothesis- a tentative (untested) explanation Theory- a well-tested and widely accepted view that the scientific community agrees best explains certain observable facts

Which of the following is not an example of alpine glaciation?

Ice Sheet

How does a glacier lose ice through sublimation?

Ice changes from solid to gas.

Example of a country that is situated on top of Mid Atlantic Ridge

Iceland

K+ Feldspar, Muscovite, Quartz, and Sodium rich Plagioclase Feldspar

If a felsic rock is found, what minerals are expected to compose it?

the limestone is the oldest and the succession is comformable

If a limestone, a shale, and a sandstone are deposited in that order without interruption, which of the following is true?

Olivine, Pyroxene, Plagioclase Feldspars that are rich in Calcium

If a mafic rock is found, what minerals are expected to compose it?

A small amount of Pyroxene, Amphibole, a good bit of Biotite, and Plagioclase Feldspars that have a mix of Calcium and Sodium

If an intermediate rock is found, what minerals are expected to compose it?

What would be one of the aspects that the continents didn't float across the ocean?

If continents move like boats there should be some rocks at the bottom of the ocean. Which there is not because it was as flat as flat could be my friend.

icehouse conditions

If glaciers cover too much of the Earth's surface, they could potentially reflect so much sunlight that the Earth could remain cold for a long period of time.

the surface of a lava flow

In what type of igneous feature would you find rocks with a vesicular texture?

Extrusive

In what type of magma would you find larger phenocryst with a fine grained ground mass?

Intrusive

In what type of magma would you find very large phenocryst with coarse-grained ground mass?

rhyolitic

In which of the following lava types would you expect to find the greatest percentage of gases?

basaltic

In which of the following lava types would you expect to see the development of pahoehoe?

rhyolitic

In which of the following types of lavas would you expect to find the greatest production of pyroclastic material?

a well for industrial purposes is drilled proximal to a smaller, domestic well

In which situation does the cone of depression need to be taken into account?

Mountain River

In wich environment would you NOT expect shale to form?

Partial melting and magma formation

Incomplete melting of rocks is known as partial melting

Many mineral crystals

Increase viscosity

Why is the use of proxy data necessary when studying past climate change?

Instrumental records only go back a couple of centuries and are more incomplete the older they are

Diorite

Intermediate

Intermediate Grade

Intermediate temp and pressure

_____ igneous rocks are those that cool below the surface.

Intrusive

Extrusive; Pillow lava forms by extrusive flows at mid-ocean ridges, where seawater rapidly cools basaltic lava into pillow-shaped blobs.

Is pillow lava intrusive or extrusive?

Which of the following is not part of the Milankovitch Cycle?

Isostacy

Pangaea seperated into...

Laurasia (northern) and Gondwanaland (southern)

What volcanoes eject

Lava, Large volumes of gas, Pyroclastic materials-broken rock, lava bombs, ash & dust.

what volcanoes eject

Lava, Large volumes of gas, Pyroclastic materials-broken rock, lava bombs, ash & dust.

lunar highlands

Light colored features on the moon's surface; Mountains on the moon.

mid ocean ridge

Linear mountain ranges in Earth's ocean basins.

outer core

Liquid layer 2270 km thick, metallic iron that moves to make the magnetic field.

Parts that make magma

Liquid, Solid, and Gas

Plate=

Lithosphere

Which of the following spheres is not part of the climate system?

Lithosphere

What are earth's zones based on physical properties?

Lithosphere - the rigid outer layer of Earth that consists of the crust and the upper mantle Asthenosphere - the soft, weak layer below the lithosphere Transition zone - a zone marked by a sharp increase in density below the asthenosphere Lower Mantle - a zone of strong, very hot rocks subjected to gradual flow below the transition zone Outer core - liquid outer layer of the core Inner core - solid inner layer of the core

Hot Spots

Locations of active volcanism with increased heat flow

Low Grade

Low temperature and pressure

Chert

Made up of Quartz. Brown/tan/red. Angular, smooth

Basalt

Mafic

The Difference between Mafic and felsic

Mafic is MAgnesium and FErrum it is darker and has greater density. Felsic is FEldspar and SIlica it is 10% biotite and amphibole and is a major part of the continental crust.

Silica rich

Magma becomes more ____ ____ with cooling

Three ways in which magma can travel through Earth's crust.

Magma can travel upward as rocks above magma chambers collapse Magma can travel through existing fractures in rock, forming fissures and dikes Magma can travel in regions where tectonic forces have newly fractured solid rocks

The Difference between Magma and lava

Magma is molten material which cools to form igneous rock. Lava is magma at the earths surface.

What is the difference between magma and lava?

Magma is molten rock located below the surface; lava is molten rock erupted above ground.

Porphyritic

Magma that has gone through the 2 stages of cooling?

lava

Magma that is erupted onto the surface, or the rock mass into which it solidifies

Porphyritic Rhyolite

Magma/Lava Type: felsic Cooling Environment: intrusive then extrusive, cools slowly then fast Texture: porphyritic, large grains, surrounded by fine grains Characteristics: very light colored, whites and pinks or light grays mostly. Contains quartz, feldspars, muscovite, and few darker minerals

Pegmatitic Granite

Magma/Lava Type: felsic (this one), intermediate, or mafic Cooling Environment: intrusive, plutonic, very slow cooling Texture: pegmatitic, very large (2.5cm+ in size) grain size Characteristics: A very large grained version of granite, diorite, or gabbro

Porphyritic Andesite

Magma/Lava Type: intermediate Cooling Environment: intrusive then extrusive, cools slowly then fast Texture: porphyritic, large grains, surrounded by fine grains Characteristics: medium dark color, darker grays and blacks, usually an even mix between light minerals and dark minerals

Scoria / Vesicular Basalt

Magma/Lava Type: mafic Cooling Environment: extrusive, volcanic, thrown from the volcano, very rapid cooling Texture: vesicular, pyroclastic Characteristics: full of bubbles, often floats in water it is so light, looks like burnt sugar, always black

How will melting permafrost in polar regions lead to a positive feedback loop?

Methane will be released as the vegetation thaws

topographic map

Map showing the elevation of the land surface, with a series of contour lines

Metamorphic

Marble, slate, quartzite are examples of what type of rock

density

Mass per unit volume

Viscosity

Measure of a material's resistance to flow. High viscosity flows easily

Moment magnitude scale

Measures the total energy released during an earthquake by determining the average amount of slip on the fault, the area of the fault surface that slipped, and the strength of the faulted rock

The Jurassic Period lies in the _____ Era, which was dominated by large terrestrial vertebrates, or _____.

Mesozoic; dinosaurs

Lusters

Metallic= dense, dark streak. earthy=dull. Vitreous=glassy

lusters

Metallic= dense, dark streak. earthy=dull. Vitreous=glassy

An igneous rock becomes buried, is subject to high heat and pressure, and recrystallizes. This rock then is eroded, transported, deposited and subsequently lithified. Which rock types—in order—did the original igneous rock develop into?

Metamorphic and sedimentary

polar wandering curve

Migration during geologic time of the earth's poles of rotation and magnetic poles. Aka Chandler motion; polar migration. the curve that is created when all points of a certain location over different periods of time are plotted

Natural Inorganic Solid Posses an orderly internal structure of atoms Have a definite chemical composition

Mineral properties

1. olivine, 2. pyroxene, 3. amphibole, 4. biotite, 5. quartz

Minerals in order from 1-5 when they will crystallize from magma first to last.

silicates

Minerals that contain silicon-oxygen tetrahedra; the most common mineral group on Earth, Compromise most of earth's crust and mantle

magma

Molten rock, which may or may not contain some crystals, solidified rock, and gas

magma

Molten rock, which may or may not contain some crystals, solidified rock, and gas.

Which of the following budget scenarios describes a glacial advance?

More ice and snow accumulates than melts each year.

What are geological hazards? Give an example.

Natural processes that adversely affect people. For ex. Volcanoes and earthquakes.

Which of the following is not part of the definition of a mineral?

Naturally occurring Definite chemical composition Organic(X) Orderly crystalline structure

The __________ proposes that the bodies of our solar system formed at essentially the same time from a rotating cloud of gases and dust

Nebular Theory

divergent

New igneous rock is created at what type of plate boundary?

Sea Floor Spreading

New oceanic crust is created along Mid-Oceanic Ridges and moves away from the ridge

Which two gases make up the majority of the atmosphere?

Nitrogen and Oxygen

Marble

Non foliated, calcareous, Metamorphic

Anthracite Coal

Non foliated, organic, best kind of coal, Metamorphic

Quartzite

Non foliated, quartzo-felspathic, Metamorphic

why are oceans generally shallower in the center than near the edge?

Objects pile up near the crust creating a slope

Scientific Method

Observe and Question. Form hypothesis. Test hypothesis

observations

Observing: We look, listen, smell, and feel so we can record and analyze what is around us.

Continent-continent convergence

Occur along convergent plate boundaries when both plates are capped with continental crust - Himalayas and Alps

Contact Metamorphism

Occurs near the contact of hot/molten igneous intrusions, can also result in the recrystallization of minerals in quartz-rich rocks like sandstone to form quartzite, and calcite-rich rocks like limestone to form marble

What are the two types of crust?

Oceanic and continental

Oceanic Drilling

Oceanic crust is young near spreading ridges and older the further you move away

Which type of convergence will result in a volcanic island arc?

Oceanic-Oceanic

Name same differences between continents and ocean bases.

Oceans are younger and flatter Continents are less dense Continents rocks are significantly thicker

isotope

One of two or more species of the same chemical element but differing from one another by having a different number of neutrons

Ionic Bond

One or more valence electrons transferred, producing a relatively weak bond

Approximately 50% of the Earth's crust is made up of which element?

Oxygen.

Which of the following plates is the largest?

Pacific Plate.

________ is the study and reconstruction of past climates through the use of proxy data.

Paleoclimatology

The ____________ division of the geologic time scale is an era of the Phanerozoic eon.

Paleozoic

volcanic ash

Particles of volcanic tephra that are sand-sized or smaller, and accumulations of such material

Seafloor Spreading

Patterns of magnetic vibrations on the oceans floor

Mica

Peals into sheets

Color Luster Habit Streak Hardness Cleavage

Physical Properties of minerals

How does an end moraine form?

Pieces of rock are transported to the front of the glacier as ice within the glacier moves.

A submarine volcano; Pillow lava is a low-silica-content, basaltic lava associated with underwater effusive eruptions.

Pillow lavas are evidence of what volcanic circumstance?

Lithosphere=

Plate

Transform Plate Boundaries

Plate boundary where plates slide past each other without production or destruction

Divergent Plate Boundaries

Plate diverge and move away from each other creating new materials

Subduction zones

Plate margins where oceanic crust is being consumed. Becomes molten rock due to temp and pressure

What happens at a convergent plate boundary?

Plates move together

Convergent boundary

Plates move together and causes subduction of oceanic lithosphere into the mantle. Collision of two continental margins to create a mountain system.

Rotation

Platy minerals can be rotated by tectonic stresses accompanying metamorphism to form metamorphic cleavage, foliation,and lineation

______ is an erosional method where meltwater penetrates fractures in subglacial bedrock and freezes.

Plucking

Porphyritic, Phaneritic, vesicular, Aphanitic, glassy and Pegmatitic

Porphyritic texture is large crystals in small crystals. Phaneritic texture is coarse grained and formed when magma slowly solidifys. Vesicular texture has tiny holes and cooled very quickly. Aphanitic texture is fine grained and formed at the surface. Glassy texture forms when molten rock is ejected into the atmosphere and cools quickly or has high silica. Pegmatitic texture has crystals that are large and very coarse rocks called pegmatites.

photic zone

Portion of the marine biome that is shallow enough for sunlight to penetrate.

Bowen's Reaction Series

Predictable sequence of minerals that crystallize from a cooling magma

Ultramafic composition

Rare composition that is high in magnesium and iron Composed entirely of ferromagnesian silicates

locked faults

Pressure pushes together the irregular walls of the fault; surfaces resist sliding

proton

Principal particle of an atomic nucleus with a positive charge

Metallic

Produced when electrons are free to migrate from one atom to another

Match the paleoclimate proxies to the information they can provide about the past climate. Corals

Provide info about past temperature

Match the paleoclimate proxies to the information they can provide about the past climate. Tree Rings

Provide periods of plentiful rain and drought

Match the paleoclimate proxies to the information they can provide about the past climate. Pollen

Provide vegetation patterns for a location

1. Clay, 2. Silt, 3. Sand, 4. Pebble, 5. Cobble

Put the following list of clasts in order from smallest to largest.

Quartz

Pyramid crystals; scratches glass

Sulfides

Pyrite (FeS2) and pyrrhotite (FeS) are the most common ___

Hornfels

Pyroxene-Felspar rich contact metamorphic rock

Main silicate minerals

Quartz and Feldspar

inner core

Radius of 1,220 km Denser than outer core solid

acid rain

Rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water.

Metamorphic Grade

Refers to the intensity of metamorphism

Earth's surface is divided into continents and ocean basins. What is the difference between these two areas?

Relative levels - The elevation difference is a result of differences between density and thickness • Continents are relatively flat plateaus approximately 0.8 kilometers above sea level composed of granitic rocks • The average depth of ocean basins, composed of basaltic rocks, is 3.8 kilometers below sea level

What is the connection between people and Geology?

Resources (without geology our standard of living would be lower)

Foliation

Result of Regional Metamorphism, layered or banded appearance as a result of exposure to heat and directed pressure

Intraplate Volcanism

Result of mantle plumes or hotspots

Give an example of where continental drifting is occurring in present day?

Rio Grande Rift and East-African Rift.

Silicate Mineral

Rock forming minerals make up 90% or Earth's surface

How are changes in sea level recorded in rock?

Rock type changes vertically.

outcrop

Rock-Exposure

metamorphic rocks

Rocks changed by temperatures, pressures, or deformation

Igneous Rock

Rocks formed by the cooling and solidification of molten material

igneous rocks

Rocks formed from cooled and solidified magma

Plutonic Intrusive

Rocks formed inside Earth are called ____ or ____ rocks

Volcanic Extrusive

Rocks formed on the surface are called ____ or ____

What does the metaphor "One rock is a raw material for another" mean?

Rocks melt down, or erode and by doing so become another.

Paleomagnetism

Rocks of the same age around the world are very different, meaning 1) the magnetic poles migrated 2) the continents moved

Metamorphic Processes

Rocks remain essentially solid during metamorphism; re-melting occurs only at the highest metamorphic grade

hydrothermal rocks

Rocks that precipitate from hot water

coarse grained

Rocks with mineral grains large enough to see without a magnifying glass. observe coarse-grained rocks by cutting a slab and by using a hand lens

Nebula

Rotating diffuse cloud of gas that makes up most of our solar system

Where do most people live in urban or rural areas?

Rural areas

Halite

Salty

Which one of the following observations and inferences is consistent with the idea of uniformitarianism?

Sand rolling along a stream bottom shows that sediment is moving downstream

Parent Rocks (of Metamorphic Rocks)

Sandstone Quartzite Slate Phylite Limestone Marble Granite Gneiss Bituminous Coal/Dead Plants Anthracite Coal Shale Slate Phylite/Basalt/Slate Schist Quartz/Feldspar Mica

Sedimentary

Sandstone, limestone are example of what type of rock

Titan

Saturn's largest moon

Geology

Science that pursues an understanding of Earth, its history, its components, and its physical and chemical characteristics

Scientific Method

Scientific method involves gathering facts through observations and formulation of hypotheses and theories

How did sea level change to produce this sequence of rocks? [TOP: Limestone, MID1: Mud, MID2: Sand, BOTTOM: Mud]

Sea level fell and then rose.

How did sea level change to produce this sequence of rocks? [TOP: Mud, MID1: Limestone, MID2: Mud, BOTTOM: Limestone]

Sea level fell, then rose, and then fell again.

How did sea level change to produce this sequence of rocks? [TOP: Sand, MID: Mud, BOTTOM: Limestone]

Sea level fell.

How did sea level change to produce this sequence of rocks? [TOP: Limestone, MID: Mud, BOTTOM: Sand]

Sea level rose.

How would you expect sediment to change as you walk from shore into the ocean?

Sediment generally changes from sand to mud to limestone.

what do we think a typical section of the ocean crust looks like?

Sediment layer Pillow Basalts sheeted dykes gabbro -moho- peridotite

Which of the following is commonly used to determine the age of seafloor samples?

Sediment thickness (was carbon-14 dating).

What is the difference between between shield and stable platform?

Shield is like a flat expansion

why cant sulfates(SO4) form chains and sheets while silicates (SiO4) can?

Silicates have more electron to bind with

Which of the following elements is more abundant in Earth's crust than in Earth as a whole?

Silicon.

Granulite

Sillimanite/Pyroxene/Quartz Migmatite High Grade Metamorphic Rock, forms in the inner core of collisional mountain belts, Intermediate-high P&T

Pedalfer

Soil that is characterized by an abundance of aluminum and iron oxides.

inner core

Solid part of earth's core

mantle

Solid rock, 2,885 km thick, 82% of Earth's volume.

Geosphere

Solid rocky Earth

kerogen

Solid, waxy mixture of hydrocarbons found in oil shale rock

role of heat

Temperature increases within Earth's upper crust (called the geothermal gradient) average between 20º and 30ºC per kilometer

lithosphere

Sphere of rock. 100-250 km thick. Thin in ocean basin, thick in older oceanic crust.

inner core

Sphere with radius of 1216 km has a high temperature but strong anyway because of immense pressure. (acts like a solid, like magic mud)

What evidence supports that the glaciers on the southern continents were once part of a single, massive ice sheet?

Striations

Covalent Bond

Strong bonds produced when two atoms share valence electrons

Continental Drift Hypothesis

Supercontinent called Pangaea began breaking apart about 200 million years ago Continents "drifted" to present positions Continents "broke" through the ocean crust

The Difference between Tabular and massive

Tabular is table like and massive is large in size.

The softest and hardest minerals on the Mohs Scale of Hardness

Talc (1) is the softest and Diamonds (10) are the hardest.

What is a transform plate boundary?

Tectonic plates that slide past each other

Grain Flattening/Elongation

Tectonic stresses accompanying metamorphism will flatten or elongate preexisting mineral crystals

Why are isochrons on the Pacific seafloor more widely spaced than isochrons on the Atlantic seafloor?

The Pacific seafloor formed at a faster spreading rate than the Atlantic seafloor.

Why is the geologic time scale more detailed in the Phanerozoic than in previous eons?

The Phanerozoic Eon is more detailed because of the presence of organisms with hard parts and the rapid increase in biodiversity.

zone of saturation

The _ is the point in the subsurface where 100% of the pore spaces are filled with water

asthenosphere

The area of mantle beneath the lithosphere that is solid, but hotter than the rock above it and can flow under pressure; functions as a soft, weak zone over which the lithosphere may move

The upper mantle can be divided into the asthenosphere and lithosphere based on what physical properties?

The asthenosphere is solid, but mobile, while the lithosphere is solid and relatively rigid.

What happens to the atmosphere as you move away from Earth's surface?

The atmosphere thins.

What are the three geodynamic systems?

The climate, the plate tectonic, the geodynamo systems

Streak

The color of a mineral in it's powdered form which is more consistent indication of it's color

mineral streak

The color of a mineral in its powdered form; obtained by rubbing the mineral against an unglazed porcelain plate.

streak

The color of powder a mineral leaves when rubbed against a porcelain plate

a convection current

The distinctive lava flow pattern in Erta Ale's crater is important because it is similar to the processes occurring deep inside the earth. The repetitive process whereby magma rises from the mantle, cools and solidifies, and then sinks and liquefies is called __________.

Crust

The earth's thin rocky outer skin. Has two types: oceanic and continental. Oceanic crust is 7km thick, dark igneous rocks called basalt. 180 million years old and dense. Continental crust 35-70 km thick, many rock types 4 billion years old and less dense.

Crystal Form

The external expression of the orderly internal arrangement of atoms

matrix

The finer grained material enclosing or filling the areas between larger grains, crystals, or fragments of a rock.

crystal face

The flat exterior surface of a crystal

texture

The general physical appearance or character of a rock, especially the size, shape, and arrangement of minerals and other materials

Limestone

The general term for a non clastic sedimentary rock that is composed of the mineral calcite is ________________.

Law of Superposition

The geologic principle that states that in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layer below it.

How would you expect the front of a glacier to move if it undergoes a period of net accumulation, followed by net wastage, and finally a period of net accumulation?

The glacier's front would move forward, backward, and then forward again.

Geothermal gradient

The gradual increase in temperature with depth in the Earth is known as the ____________________________________.

down; normal

The hanging wall moves _ relative to the footwall in a _ fault.

Match the layer of the atmosphere with the correct description. Troposphere

The layer of the atmosphere with the greatest amount of air molecules. Temperatures decrease from bottom to top

muscovite, orthoclase feldspar, plagioclase feldspar, and quartz

The light silicate minerals include __________.

Base Level

The lowest point to which a stream can erode

troposphere

The lowest region of the atmosphere between the earth's surface and the tropopause,

Sill

The mafic intrusion that is parallel to other layers in this figure is known as a __________________.

mode

The mineral composition of a sample of igneous rock.

Protolith

The minerals making up a preexisting rock can change during metamorphism

atmosphere

The mixture of gases surrounding a planet.The Earth's atmosphere consists chiefly of oxygen and nitrogen, with minor amounts of other gases. Synonymous with air. Used to be lots of CO2, but got turned into limestone by all the little organisms

The amount of damage to structures caused by an earthquake

The modified mercalli intensity scale rates earthquake intensity by?

Saltation

The movement of sand or other sediments by short jumps and bounces that is caused by wind or water

hypocenter

The name of the site where slippage begins and earthquake waves radiate outward is called the _.

wave speed

The names primary and secondary refer to?

atomic mass

The number of neutrons and protons in an atom

Uniformitarianism

The physical, chemical, and biologic laws that operate today have operated throughout the geologic past

Uniformitarianism

The physical, chemical, and biological laws that operate today also operated in the geological past

Uniformitarianism

The physical, chemical, and biological laws that operate today have also operated in the geologic past

sea floor spreading

The process by which two oceanic plates move apart and new magmatic material is added between the plates

assimilation

The process in which melted wall rocks become incorporated into magma.

sorting

The range of clast sizes in a collection of sediment

geothermal gradient

The rate at which temperature increases with depth into the subsurface

specific gravity

The ratio of the density of a substance to the density of freshwater

What is Geology?

The science that pursues and understanding of planet earth.

Paleomagnetism

The study of the alignment of magnetic minerals in rock,specifically as it relates to the reversal of Earth's magnetic poles; also the magnetic properties that rock requires during formation

violent and explosive

The subduction of oceanic crust under continental crust predominantly produces which of the following types of volcanic eruption?

Cleavage

The tendency of a mineral to break along planes of weak bonding when stressed

Match the layer of the atmosphere with the correct description. Mesosphere

The third layer of the atmosphere where the coldest temperatures are found

define mesospheres

The third layer of the atmosphere where the coldest temperatures are found

mantle

The voluminous layer of Earth located below the crust and above the core

cleavage

The way minerals break along a specific set of planes

continental margin

The zone of transition from a continent to the adjacent ocean basin. It generally includes a continental shelf, continental slope, and continental rise.

Plate Techtonics Theory

Theory hypothesized in the 1960's that says the lithosphere is broken into rigid plates that float on the asthenoshpere

Granite

Tough, hard granite rock is used in buildings and monuments. It is made of mineral crystals: white quartz, pink feldspar, and black mica.

Where do you see the youngest oceanic rocks or youngest seafloor?

Towards the center of the Mid-Oceanic Ridge

radiant heat transfer

Transfer of thermal energy as electromagnetic waves.

conduction

Transfer of thermal energy by direct contact.

convection

Transfer of thermal energy by flow of a liquid or a solid, but weak material.

Match the paleoclimate proxies to the information they can provide about the past climate. Ice Cores

Trap gases to provide info about the atmosphere

ice cores

Trap gases to provide info about the atmosphere

Who first proposed the three different kinds of plate boundaries widely accepted today?

Tuzo Wilson.

Meandering Stream

Twisting stream with many curves that erodes on the outside of meanders and diposits sediment on the inside of meanders.

The rate of decay of atoms in container A is greater than the rate of decay of atoms in container B.

Two containers hold the same radioactive isotope. Container A contains 1000 atoms, and container B contains 500 atoms. Which of the following statements about containers A and B is true?

Peridotite

Ultramafic

____________ is often paraphrased as "the present is the key to the past."

Uniformitarianism

Flux Melting

Water added to hot rock lowering the melting point

Hydrosphere

Water on or near the Earth's surface

Name the epoch, period, era and eon in which we currently live.

We live in the Holocene Epoch of the Quaternary Period, which is part of the Cenzoic Era and Phanerozoic Eon.

Ash

What are fragments that are smaller than a sand grain in size?

Vesicles

What are gas-bubble holes frozen into lava as it solidifies?

Ash flows

What are ignimbrites generated by?

Batholiths

What are intrusive igneous structures?

Plutonic

What are intrusive rocks also called?

Pore spaces between rocks and sediments

Worldwide, the largest percentage of fresshwater readily available to humans is stored in?

Fast cooling rate

Would you expect magma that formed this igneous rock to have had a fast cooling rate or a slow cooling rate, based on the grain size?

Will plucking occur if a glacier is NOT advancing?

Yes, because glacial ice is still moving inside the glacier even if the glacier's front is not advancing.

Is San Andreas Fault in California a transform plate boundary?

Yes, because it connects two divergent plate boundaries that side against each other

You are working in a field area that you think at one time contained valley glaciers. What evidence would you look for to determine this?

You would look for rounded, U-shaped valleys.

Which part of a glacier will see the build-up of ice and snow over the course of a full year?

Zone of accumulation

aftershocks

_ are smaller earthquakes of lesser magnitude that follow a major earthquake

Megathrust; convergent

_ faults are associated with _ plate boundaries

Magma Lava

__ is molten rock located below the surface __ is molten rock erupted above ground

Chemical weathering

___ ___ is most effective in areas of warm temperatures and abundant moisture

sedimentary rocks

___ ____ form when weathered particles are cemented and/or compacted

intrusive

___ igneous rocks are those that cool below the surface

Shield

___ volcanoes form from low-viscosity lava

extrusive realm

____ _____ is at the surface

intrusive realm

____ _____ lies underground

Plutons

____ form when magma cools slowly at depth; erosion gradually exposes the granite

drainage network

a map showing the courses of al the large and small streams in a drainage basin reveals a pattern of connections

Benchmark

a mark on a permanent object indicating elevation and serving as a reference in topographic surveys and tidal observations.

slump

a mass of onconsolidated material slides slowly downslope as a unit, leaving a scar at its source

chemical stability

a measure of substances tendency to retain its chemical identity rather than reacting spontaneously to become a different chemical substance

geothermometer

a mineral assemblage that reveals the maximum temperature attained by a rock -in lower temps the amount of Mg in Calcite and the amount of Ca in Dolomite can be used as a geothermometer

quartz

a mineral composed of silicon dioxide

muscovite

a mineral in the group mica

Graphite

a mineral with relatively weak covalent bonds - made of carbon

diamond

a mineral with strong covalent bonds - made of carbon

tenacity

a mineral's physical reaction to stressful forces acting upon it

hardness

a mineral's resistance to being scratched

tenacity

a mineral's resistance to deformation

Mineral

a naturally occurring, inorganic solid that has a crystal structure and a definite chemical composition

Nuclear fusion

a nuclear reaction in which 2 atomic nuclei of low atomic number fuse to form 1 heavier nucleus with the release of energy.

Nuclear fission

a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy.

aquitard

a perched aquifer is located directly above an_

exfoliation

a physical weathering process in which flat or curved sheets of rocks are detached from an outcrop

xenolith

a piece of rock of different origin from the igneous rock in which it is embedded

oxbow lake

a present shaped, water-filled loop

Determine in which igneous setting welded and nonleaded textures form by matching the texture to the setting. Welded Nonwelded

a pyroclastic flow deposit close to a volcanic eruption site a ash deposit distance from a volcanic eruption site

perched water table

a quantity of groundwater that lies above the regional water table because an underlying lens of impermeable rock or sediment prevents the water from sinking down to the regional water table

Gradient

a rate of inclination; a slope

rain shadow

a region with dry conditions found on the leeward side of a mountain range as a result of humid winds from the ocean causing precipitation on the windward side

seismic gap

a region without seismic activity for one or more centuries

Strategic Resources

a resource that is important for a country's industries or national security (i.e. petroleum→ gasoline, lead→ ammunition, chromite→ jet engines)

antecedent stream

a ridge is formed by deformation while a preexisting stream is flowing over it, the stream may erode the rising rise to form a steep- walled gorge

What is an end moraine?

a ridge of debris deposited at the end of a glacier

divide

a ridge of high ground along which all rainfall runs off down one side or the other

tributaries

a river or stream flowing into a larger river or lake

how did the cold war contribute to the discovery of plate tectonics?

according to wiki during the 1950s and early 1960s, scientists set up seismograph networks to see if enemy nations were testing atomic bombs. Seismographs record seismic waves. While watching for enemy atom bomb tests, the seismographs were also recording all of the earthquakes that were taking place around the planet. These seismic records could be used to locate an earthquake's epicenter, the point on Earth's surface directly above the place where the earthquake occurs. Earthquakes are associated with large cracks in the ground, known as faults. Rocks on opposite sides of a fault move in opposite directions. Scientists noticed that the earthquake epicenters were located along the mid-ocean ridges, trenches and large faults that mark the edges of large slabs of Earth's lithosphere (Figure 6.13). They named these large slabs of lithosphere plates. The movements of the plates were then termed plate tectonics

contact metamorphism

adjacent to igneous intrusions and along fractures in contact with hydrothermal fluid caused by low to moderate pressure, intense heating, and reaction with magma or hydrothermal fluids

geothermal gradient

aka geotherm the curve where the temp. within the earth increases with depth

diagenesis

aka lithification the process that converts wet gooey layers of sediment into hard dry rock

parental magma

aka primitive magma produced by partial melting in the mantle

phreatic zone

all open pore space is filled with water (saturated)

why do metallic bonds conduct electricity?

all the atoms in the structure effectively share the electrons that are moving free through out the the structure

biosphere

all the life on earth

Earth system

all the parts of our planet and all their interactions, taken together

hydrosphere

all the waters on the earth above the solid crust

Magnitude

amount of ground motion

A diorite is mainly composed of...

amphibole, biotite & feldspar

drainage basin

an area of land bounded by divides, that funnels all its water into the network of streams draining that area

Darcys law

an equation that describes the flow of a fluid through a porus medium

flood

an extreme case of increased disracheg that results from a short-term imbalance between inflow and outflow

the fault is the youngest because it cuts through all the sedimentary layers and basalt

an igneaous dike cuts across existing sedimentary layers and erupts at the surface, creating a layer of basalt. the basalt, as well as all the layers below, are then cut by a fault. Which statement is tue?

stream

any body of water, large or small, that flows over the land surface and river for the major branches of a large stream system

Asbestos

any natural mineral fiber with an aspect ratio greater than 10

Rocks

any naturally occurring solid mass of mineral or mineral-like matter

Isotope

any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weights

climate model

any representation of the climate system that can produce one or more aspects of its behavior

Compared with the amount of ice that existed during the last glacial maximum, how much exists today?

approximately 1/3 as much

Deep-ocean trenches

are deep and relatively narrow depressions that make up only a small portion of the ocean floor

Seismometers

are instruments that sense earthquake waves and transmit them to a recording device

Seamounts

are small volcanic structures that dot the ocean floor

Oceanic ridges

are the most prominent feature on the ocean floor and are composed of igneous rock that has been fractured and uplifted

Continental margins

are the portion of the seafloor adjacent to major landmasses

Deep ocean basins

are the portions of the seafloor between the continental margins and the oceanic ridges

ripples

are very small diners with heights raining from less than a centimeter to several centimeters whose long dimension is formed at right angles to the current

rain shadows

areas of low precipitation on their leeward slopes

hot dry rock

areas with abundant heat but little natural underground water

____________ was the highly influential, ancient Greek philosopher noted for his writings and teachings on natural philosophy and on the workings of Earth

aristotle

Caldera

as a magma chamber drains, the collapse begins, which is called a ____.

the mantle and crust

as a result of partial melting, magma originates in ___.

crystals form

as magma moves...

retrograde

as the rocks are returned to the surface during uplift and erosion they are progressively cooled and depressurized and may undergo this type of metamorphism reaction which generally occurs under fluid absent conditions

fire fragments

ash and dust: fine, glassy fragments

The ________ is not a part of the Earth's physical environment.

astrosphere

Where is the most likely location for molten rock to cool and minerals to form quickly?

at earth's surface

unsaturated zone

at shallow depths, the material is unsaturated: the pores contain some air and are not completely filled with water

covalent bond

atoms combine by sharing electrons from overlapping outer shells

ions

atoms that have lost or gained electrons

clastic

breccia, conglomerate, sandstone, shale, mudstone are all examples of what type of sedimentary rocks

Aa

basaltic lava with rough, jagged surface with sharp edges and spiny projections.

Pahoehoe flow

basaltic lavas of the Hawaiian type that form a smooth skin that wrinkles as the still molten subsurface lava continues to advance Looks like twisting braids in ropes

"Strength" Layers

based on material propertoes and physical state

Compositional Layers

based on mineralogy and density

why do we know so little about the ocean crust?

because most of the geology we study on land is related to the structure of the continental crust

why are ophiolites poor examples of ocean crust?

because most rocks in ophiolites are altered during the thrusting process so geologists have to reconstruct the original rock types from their altered remnants

why is the ocean crust so young?

because of subduction: oceanic crust tends to get colder and denser with age as it spreads off the mid-ocean ridges. It gets so dense, that it sinks in the upper mantle (=subduction).

how do some metamorphic rocks lack foliation?

because they were formed at low pressure around the contact of igneous bodies or they are made up predominantly of non planar minerals

glacial cycle

begins when a gradual decline I'm temperature of about 6 degrees Celsius to 8 from a warm interglacial period to a cold glacial period or ice age

twentieth-century warming

between the end of the nineteenth century and the beginning of the twenty-first, the average annual surface temperature rose .6 degrees Celsius

oceanic ridge

big ridge where the plates are divergin, about 1400 km wide, can rise up to 3000 m above it's surroundings. midi-atlantic ridge is 70000 km long

sandstone

bits of sand that had become cemented together

desert varnish

black layers of Mn oxides

channel

bottom of a valley, trough through which water runs

groundwater table

boundary between unsaturated and saturated zone

aquicludes

bounded above and below by low permeability beds, such as shales

Fracture (brittle)

breaking (type of deformation)

concrete

building material made by mixing small stones and sand with limestone, clay, and water

Cinder cone

built from ejected lava that begins to solidify in flight

cinder cone volcano

built from unconsolidated ejected lava.

how do we define the lithosphere/ athenosphere boundary?

by difference in response to stress

stalagmite

calcite deposit that builds up from the floor of a cave

Crystals in coarse-grained igneous rocks normally ____ be seen with the unaided eye.

can

Organic

carbon-rich remains of once living organisms.

talus

cemented sandstones ina rid environments resist erosion and break into large blocks, forming steep, bare bedrock slopes above and gentler slopes covered with broken rock

Biochemical

cemented shells of organisms.

core

center of an object (in these terms Earth)

Atomic Structure

central nucleus and orbiting electrons

All of the following provide evidence or clues to the composition of Earth's interior except for __________.

comets

Habit

common crystal shape

crystal shape (habit)

common or characteristic shape of individual crystals or aggregates of crystals

In sedimentary rocks, lithification includes __________.

compaction and cementation

pumice

compose of non-mineral matter, have no crystal structure, can float

granite composition

composed of light colored silicates .

crust

composed of low density silicates, which are rich in aluminum and potassium, from higher density silicates of the mantle, which contain more magnesium and iron

Color

composition (unreliable for ID)

soil profile

composition and appearance of soil

Coquina

composition: biochemical grain size: gravel/sand grain roundness: very angular to subangular grain arrangement: poorly/moderate

Bituminous Coal

composition: biochemical grain size: silt/ clay grain roundness: well rounded to subrounded grain arrangement: well

Micrite

composition: biochemical grain size: silt/clay grain roundness: well to subround grain arrangement: well

Calcarenite

composition: biochemical grain size: gravel/sand grain roundness: very angular to subangular grain arrangement: poorly/moderate

Oolitic limestone

composition: chemical grain size: crystalline grain roundness: well to subrounded grain arrangement: moderately/well

Dolostone

composition: chemical grain size: microcrystalline grain roundness: well to subrounded grain arrangement: moderately/ well

Chert

composition: chemical grain size: microcrystalline grain roundness: well to subrounded grain arrangement: well

Shale

composition: detrital grain size: clay grain roundness: well to subrounded grain arrangement: well

Conglomerate

composition: detrital grain size: gravel/sand grain roundness: well to subrounded grain arrangement:poorly

Sandstone

composition: detrital grain size: sand grain roundness: well to subrounded grain arrangement: well

P waves

compression and expansion

conduction vs. convection

conduction and radiation move heat. convection moves mass and heat

continental rise

consists of a thick wedge of sediment that moved downward from the continental shelf and slope to accumulate on the seafloor

intermediate composition

contain at least 25% dark silicate minerals

silica

content in crustal rocks exhibits a considerable range.

Igneous

cooled from a liquid (melt). Magma, lava, volcanoes, molten rock cooling

Columnar jointing

cooling of basaltic lava can produce...

how do silica tetrahedral form complex structures?

corner sharing of oxygens

physical weathering

cracking, crushing, and wearing away

impact crater

crater formed by the impact of a meteorite

The relatively stable interior portion of a continent is known as a __________.

craton

why is assimilation a less important process than crystal fractionation?

crystal fractionation is the early removal of crystals and is the main differentiation process while assimilation generally accounts for less than 20% of the overall differentiation process

mare basalt

dark, solidified lava that covers the lunar maria

relative dating

dates are placed in their proper sequence.

Sedimentary

debris cemented from preexisting rock. Breakdown of existing rocks sediments Sediments deposit in water, cement together over time Minerals can precipitate in water

alluvial fans

defined mountain fronts, typically steep fault scarps streams drop large amounts of sediment in cone or fanshaped accumulations

Bowen's Reaction Series

depicts the sequence that minerals crystallize from magma of average composition under laboratory conditions

texture

description of grains and other parts of a rock and their size, shape, and arrangement

atoms are bonded in a regular, repetitive, internal structure

descriptions of a mineral

lithified or consolidated aggregate of different mineral grains

descriptions of a rock

River Gradient

determined by calculating the change in elevation over the distance the river flows

Relative Age Dating

determines when something formed or happened in relation to other things

biochemical

diamictite, limestone, chert are all examples of what type of sedimentary rocks

Declination

difference between geographic North and magnetic North

Transportation

dispersal by gravity, wind, water, and ice.

Carbonates

dissolves with weak acids

The Great Rift Valley or East Africa is an early stage

divergent boundary.

chemical

dolostone is an example of what type of sedimentary rocks

Amphibole Group

double chains of tetrahedra

Which way does ice flow in a glacier retreating uphill?

downslope

mass movements

downslope movements of masses of soil, rock, mud, or other materials under the force of gravity

ecosphere (five components)

earth, rock, air, water, life

Which orbital effect describes how the shape of Earth's orbit around the Sun will change over time?

eccentricity

Which of the following scenarios will have the greatest chance of triggering an ice age?

eccentricity, obliquity, and precession overlapping to provide the least amount of solar radiation

Porphyritic Rhyolite

felsic intrusive/extrusive porphyritic

atomic mass

element (protons+neutrons)

Ridge-push

elevated MOR pushes lithosphere away.

relief

elevation difference between high and low spots

dunes

elongated ridges of sand up to many meters high that form in flows of wind or water over a sandy bed

caliche

evaporated groundwater leaves behind a layer of CaCO3 and/or CaSO4

semi-plastic behavior

ex: the asthenosphere which is solid but can slowly flow as the individual mineral grains within it are bent and recrystallized

Physical Geology

examines the materials composing Earth and seeks to understand the many processes that operate beneath and on its surface

Nonconformity

exists between sedimentary rocks and metamorphic or igneous rocks when the sedimentary rock lies above and was deposited on the pre-existing and eroded metamorphic or igneous rock.

Frost wedging

expansion of freezing water

Salt crystal growth

expansion of salt crystals in pores that cause materials to weaken and flake

Plate Tectonic Theory

explains plate motion and most major geologic phenomena (volcanoes, earthquakes, etc)

An igneous rock that solidifies on Earth's surface is called a(n) ____ rock.

extrusive

Fine Grained

extrusive rocks are...

Climate is the state of the atmosphere at a given time in a given place over s short period of time.

f

The concentration of methane in the atmosphere has been shown to be increasing for the last 1,000 years, indicating that humans are not responsible for its generation.

f

extrusive igneous rocks cool ___.

fast

Volcanic Breccia/tuff

felsic intermediate extrusive pyroclastic fragmental

forest beds

fine grained sand and silat are deposited to form this

Ash and Dust

fine, glassy fragments less than 2mm

Igneous processes on or near Earth's surface produce _____ ____ igneous rocks.

fine-grained; extrusive

Porphyritic

first deep within earth and then later near the surface

The magma that flows through a fracture in a rock forms a(n) ____ that becomes a(n) ____ when the magma solidifies.

fissure and dike

calcite

fizzes

foliated

flattened out parallel to one another and perpendicular to the stress

superposed stream

flows through resistant formations because its course was established at a higher level, on uniform rock, before downcutting began

outer core

fluid layer thick and mostly compressed of mostly iron snd Nickel

how can some sedimentary rocks be clastic, biological and chemical all at once?

for example transported animal parts that's chemically precipitated? idk because the categories are overlapping an not discrete?

deep-sea trench

form at subduction zones. lowes area of the earth's surface. next to island arcs.

intrusive rocks

form deep underground

igneous rocks

form from liquid rock (magma) in several different ways.

extrusive rocks

form near or on the earths surface

tuff cone

formed by interaction between magma and shallow water or water saturated ground

During a glacial retreat, a glacier will flow ____ while the terminus moves ____.

forward; backward

tephra

frag mental material material erupted by a volcano that is classified or subdivided on the basis of the average particle size

Pumice

from "frothy" lava

continental slope

is a relatively steep dropoff that extends from the continental shelf to the deep ocean floor

volcanic plume

gas clouds that rise from the central vent of a volcano

convection

general process in which hotter materials rises and cooler material sinks

Induction

general truth is gathered from the particular cases

color

generally an unreliable diagnostic property to use for mineral identification .

Sheeting (Exfoliation)

generates onion-like layers and exfoliation domes

Weathering

generation of detritus via rock disintegration.

continental rise

gently sloping surface at the base of the continental rise

According to the principle of uniformitarianism,

geologic processes we observe today have operated in the past.

The temperature increase with depth is called the geothermal _____.

gradient

The most common rock in the Sierra Nevada batholith is the plutonic rock ____.

granite

Slab-pull

gravity pulls a subducting plate downward.

According to Weichert's hypothesis, the chemical layering of Earth is mainly due to...

gravity.

Which of the following geologic features is not composed of stratified drift?

ground moraine

high to low pressure areas

groundwater flows from _

meteoric water

groundwater forms as raindrops and melting snow in filtrate soil and other unconsolidated surface materials and even sink into cracks and crevices of bedrock

anthracite

hard coal, 92 to 98% carbon

lithification

hardening of sediment

strength

hardness, cleavage, and tenacity

turbulent flow

has a more complex pattern of movement, in which streamlines, mix, cross, and forms soils and eddies

isotope

has the same number of protons, different number of neutrons

electron

have a negative charge Atom

proton

have a positive charge

Nonfoliated

have chemical elements from the magma and parent rock 1.Marble 2.Quartzite 3.Serpentine 4.Anthracite Coal

triple junction

he place where three tectonic plates, and three plate-tectonic boundaries, meet

accretionary heat

heat from countless meteorites hitting the planet

what is "positive heat flow"?

heat that flows from the interior to the exterior

Radiant heat transfer

heat that radiates outward from a source

Conduction

heat transfer by direct contact

Convection

heat transfer by moving material

What causes rocks to melt into magma

heat, pressure

Granitic magma

high silica content, high viscosity, and liquid exists at temperatures as low as 650 degrees celsius

earth's deep subsurface

high temperature, high pressure (high-grade) metamorphism

Mafic

high temperature, low silica

Rhyoloitic Lava Flow

high viscosity lava flow

how do we define the crust/mantle boundary?

it is within the the Mohorovicic discontinuity "Moho" and defined by a contrast in seismic velocity

How heat effects chemical bonds

it makes them weaker

The asthenosphere is...

hot and weak.

seismic waves

how do we know the earths interior

the periods of the time scale were constructed based on ranges of fossil organisms

how is the geologic time scale related to the fossil record?

luster

how light reflects from it surfaces nonmetallic and metallic

Crystal Size

how to tell apart from intrusive or extrusive?

outer planets

huge balls of gases. Jupiter, Saturn, Uranus, Neptune

rift valley

huge crack that runs along the oceanic ridge.

oil shale

hydrocarbon trapped in kerogen as fine grained sediments that have never been buries to depths where it would be converted to oil

Drowned Coasts

i. Estuaries - flooded river valleys that formed as sea level rose. ii. Fiords - flooded glacial valleys that formed as sea level rose. iii. Relationship to glaciation - melting of glaciers led to rise in sea level.

hydrosphere composition (percentages)

ice: 2% groundwater: .5 % oceans: 97.5% 71% of the earth's surface is covered in water.

why can magmas absorb volatiles (mostly water) at depth, but release them near the surface?

ie volatile transfer ???

all of the organisms had to be alive when the rock was deposited

if a rock contains ten different kinds of fossils, which of the following must be true

all of the sedimentary units must have been deposited and lithified before being cut by the fault

if a sequence of sedimentary units is cut by a fault, what does the principle of cruss cutting relationships tell a geologist.

flowing artesian well

if a well is drilled into an aquifer where the pressure surface is both above the aquifer and the ground, a _ is formed.

50:50

if one half-life has lapsed, what is the radioactive parent to stable daughter isotope ratio?

Rock that has formed from cooling magma or lava is ____ rock.

igneous

extrusive rock

igneous process on or near Earth's surface

intrusive rocks

igneous process within Earth

Where do glaciers form?

in places where more snow falls in the winter than melts away in the summer

mass wasting

includes all process by which weathered and unweathered Earth materials move downslope in large amounts and in large single events, usually by means of gravity

climate systems

includes all the earth system components that determine climate on global scale and how climate changes with time

suspended load

includes all the material temporarily or permanently suspend in the flow

Biological activity

influence of the biosphere - can also physically disintegrate rock

geologic record

information preserved in the rocks that have been formed at various times throughout Earth's history

minerals

inorganic, naturally occurring solids that have definite chemical composition, distinctive physical properties and crystalline structure

andesite, diorite

intermediate

Diorite

intermediate intrusive phaneritic

Porphyritic Andesite

intermediate intrusive/extrusive porphyritic

saltation

intermittent jumping motion along the bed

Which type of glacial movement will be responsible for the greatest amount of glacial flow?

internal flow

Dike

intrude when crust undergoes horizontal stretching - go vertically

Sill

intrudes between layers - go horizontally

Coarse Grained

intrusive rocks crystals are...

Ionic bonding

involves electron transfer

Covalent bonding

involves sharing of electrons

what are the major differences between ionic and covalent bonds?

ionic:attraction between a negatively charged atom(anion) and a positively charged atom(cation) -minerals are symmetrical. -dissolve easily in H2O, -good cleavage, -brittle, -non conductors of electricity, -moderately high melting point, - moderate hardness covalent:single electron shared between 2 atoms - less symmetrical -do not dissolve in H2o -poor/moderate cleavage -brittle -non conductors -high melting temp -high hardness

Ductile deformation

irreversible change (type of deformation)

abyssal plain

is a flat feature of the deep ocean basin

continental shelf

is a gently sloping region of continental crust extending from the shore

kettle

lakes formed where large blocks of glacial ice are buried in outwash and then form collapsed depressions when they melt

Bombs

larger than lapilli ejected as hot lava more than 64 mm (2.5 inches)

Blocks

larger than lapilli hardened lava more than 64 mm (2.5 inches)

earth's surface

lava cooling and undergoing crystallization to form extrusive igneous rocks

Aa lava

lavas that are lower in temp and have higher viscosities

pahoehoe lava

lavas that erupt at the highest temps and have the lowest viscosities

foliated rocks

layering and parallel alignment of flat mineral crystals

soil

layers of material, initially created by fragmentations of rock during weathering

Law of Lateral Continuity

layers of sediment extend in all directions horizontally. Later, a separation might be caused by a geological events such as erosion or movement during an earthquake.

light selicate

light in color, gravity of 2.7, lacks iron and magnesium

Skarn

lime-bearing siliceous rock produced by the metamorphic alteration of limestone or dolomite

Which rock types would you expect to be deposited on top of limestone if sea level rises and then falls?

limestone followed by mud

Sustainability

maintaining the ability to accommodate three important sources of change

antecedent river

maintains its original course and pattern despite the changes in underlying rock topography (the cake moves up against the knife)

The asthenosphere is actually a part of the ____________ of the Earth.

mantle

Stony meteorites are similar in composition to Earth's...

mantle.

What did most scientist thought about continents prior to 1960?

many geologists believed that the positions of the continents and ocean basins were fixed

topset beds

materials deposited on top of delta, typically sand, make up horizontal

element

matter composed of only one kind of atom

hardness

measure of its resistance to scratching

topography

measured with respect to sea level, a smooth surface set at the average level of ocean water that conforms closely to the squashed spherical shape expected for the rotating Earth

Minerals crystallize in the opposite order the they ____.

melt

non foliated

metamorphic rocks NOT containing a planer layering of fabric (ex:marble)

foliated

metamorphic rocks containing a planer layering of fabric (slate, phyllite, schist, gnesis)

burial

metamorphism

Slate

microscopic crystals/thin foliation; no visible mineral layering along foliation planes

New oceanic crust is created at

mid-ocean ridges.

lower mantle

middle sphere, between depths of 660 km and 2900 km, ridgid and hot, capable of gradual flow.

The primary difference between felsic and mafic igneous rocks is:

mineral composition

crystalization of magma

mineral composition and texture

Ingenious rocks vary in their chemical composition and subsequently in their ____.

mineral content

Important features of rocks

minerals and texture

phosphate

minerals are mined for making fertilizers, detergents

nonfoliated

no obvious layering

Silicates

not all minerals are ______

atomic number

number of protons

theory of plate tectonics

plates move stuff happens.

Color

obvious, but not diagnostic

pseudomorphs

occurring only when one mineral replaces another but retains the EXTERNAL shape of the ORIGINAL mineral

regional metamorphism

occurs over large regions caused by large igneous intrusions

abyssal floor

ocean floor, lots of sediment, flat, huge region.

The most prominent feature on the ocean floor are the __________.

oceanic ridges

tar sands

oil deposits that are exposed to erosion that form sedimentary units rich in bitumen, sand, and gravel

where is heat flow the lowest?

oldest sections of the ocean floor adjacent to continents

A peridotite is mainly composed of...

olivine and/or pyroxene

A gabbro is mainly composed of...

olivine, pyroxene & feldspar

meanders

on a great many floodplains, stream channels follow curves and bends

residence time

on average a molecule of the chemical spends a certain amount of time

Lava is molten rock that cools____.

on the surface

graded stream

one in which the slope, velocity, and discharge combine to transport its sediment load, with neither net sedimentation nor net erosion in the stream or its floodplain

Clay minerals

one of the mineral groups that exhibit a sheet-like silicate structure

frost wedging

one of the most efficient mechanisms for widening cracks in rock

Batholith pluton

one or more contiguous plutons

Yucca Mountain

only candidate for permanent underground storage site for 70,000 tons of high-level radioactive wastes from commercially operated power plants

Bituminous Coal

organic

what three ways do minerals form

organic processes or crystallize from cooled magma or dissolved in solutions

mineral cleavage

orientation and number of planes of weakness within a mineral.

The ____________ is thought to be a liquid, metallic region in the Earth's interior.

outer core

core

outer: liquid. circulatoin causes the earth's magnetic field. inner: solid

Mantle

over 82% of the earths volume. Solid, rocky shell 2900 km deep.

What are the 5 most abundant elements in the whole earth

oxygen, magnesium, iron, silicon, and aluminium (in that order).

A magma chamber that is solidified is a(n) _____.

pluton

Hypocenter (Focus)

point of rupture

Quartzite

parent rock: Sandstone foliation: nonfoliated grain size: medium to coarse grains textural description: sandy texture

Serpentinite

parent rock: basalt, gabbro, or ultramafic rocks foliation: nonfoliated grain size: fine to no visible textural description: microcrystalline texture, or no visible grains may have fibrous asbestos

Marble

parent rock: limestone foliation: nonfoliated grain size: medium to coarse textural description: microcrystalline or medium to coarse crystalline texture

Schist

parent rock: mudstone foliation: foliated grain size: medium to coarse textural description: foliation from alignment of crystals, scaly foliation surfaces, crystalline texture

Slate

parent rock: mudstone or shale foliation: foliated grain size: fine to no visible textural description: flat slaty cleavage is well developed

Phyllite

parent rock: mudstone, shale, or slate foliation: foliated grain size: fine to no visible grains textural description: well developed more than slaty cleavage

Gnesis

parent rock: mudstone, shale..etc foliation: foliated grain size: medium to coarse textural description: gneissic banding, minerals segregated into alternating layers

Anthracite Coal

parent rock: peat...etc foliation: nonfoliated grain size: fine to no visible grains textural description: glassy, slaty cleavage barely visible

abyssal hill

part of the abyssal floor

thermohaline circulation

part of the large-scale ocean circulation that is driven by global density gradients created by surface heat and freshwater fluxes

When igneous rocks are formed, the source area usually ____.

partially melts

ppm

parts per million

plaster

paste that hardens to a smooth solid and is used for coating walls

A _____ is defined as a chain of glacial lakes where each lake flows into the next.

pater noster lake

geochemical cycles

patterns of flow, or flux, of chemical from one component of the earth system to another

biotite

peals

Lignite

peat first converts to lignite, 70% carbon, brown coal

milankovitch cycles

periodic variations in earths movement around the sun

droughts

periods of months or years when precipitation is much lower than normal

permineralization

petrified wood is an example of what type of fossil preservation?

Weathering

physical or chemical

kames

piles of outwash that collected in depressions the surface of a glacier and were left as hills once the glacier melted

Epicenter

point on surface

Mafic

poor in silica; dark colored

Proton

positive charged particle

Streak

powdered mineral

Re-crystallization

preexisting minerals recrystallize to form new crystals that are different sizes and shapes

____ and ____ increase with depth into Earth.

pressure and temperature

infiltration

process by which water enters rock or soil through cracks or small pores between particles

Absolute Age Dating

process of determining when something formed or happened in exact units of times such as days, months, or years

Nebular Theory

proposes that the bodies of our solar system evolved from an enormous rotating cloud called the solar nebula

Volcanic Hazards

pyroclastic flows, lahar, flank collapse, ash fall/clouds, gas, tsunami, climate change, acid rain

ash and cinders

pyroclastics debris from a volcanic eruption can include ___.

Luster

quality and intensity of light reflected from a mineral; metallic:

A granite is mainly composed of...

quartz, feldspar & mica

REEs

rare earth elements

Kimberlite

rare, ultramafic rock that can contain diamonds and other minerals formed only under very high pressures.

specific gravity

ratio of the weight of a mineral to the weight of an equal volume of water

Deduction

reasoning which proceeds from a universal premise to a particular conclusion.

Felsic

rich in silica; light colored

natural levees

riders of coarse material that confine the stream within its banks between flood, even when water levels are high

ocean basin

rock above the oceanic crust. oceanic crust is about 8 km thick

Metamorphic

rock altered by pressure and temperature. Igneous or sedimentary rocks that have been changed

aquifers

rock formations through which groundwater flows in sufficient quantity to supply wells

Tuff

rock formed from the fusing of fine glassy fragments that were created by hot gasses melting ash

how is the fact that there are not absolute boundaries for rock types reflected in the difference between mineral names and rock name?

rock names/definitions are generally chosen because they represent types of rocks with particular sets of characteristics (the names can therefore provide alot of info about a rock without having to write an entire description)

Anorthosite

rock of aluminum and calcium silicates found in the lunar highlands

Bedrock

rock still attached to the Earth

parent rock

rock type that was metamorphised can be igneous, sedimentary, or metamorphic

metamorphic rocks

rocks deformed or changed from one form to another by intense heat, pressure or reaction to hot fluids

pro grade

rocks that are slowly buried and progressively metamorphosed at higher and higher temperatures and pressures are said to undergo this type of metamorphism reaction which occur with excess fluid present b/c it is likely to liberate water and the minerals are generally courser and better preserved than retrograde

tholus

round building; dome; cupola

pillow bassalt

rounded blobs of volcanic basalt that cooled underwater

A'a

rubbly volcanic surface

Sabkhas

salt deposits in the upper part of soil or the ground

classification of sedimentary rocks grain

sand silt gravel

abrasion

sand and pebbled the stream carries create sandblasting action that wears away even the hardest rock

Which rock types would you expect to see deposited if sea level rises and then falls?

sand covered by mud covered by sand

what is the difference between schist and gneiss?

schist-mineral grains clearly visible, rich in micacaneous minerals(sparkly stuff), minerals intermixed Gneiss- course grain size, segregation of minerals into layers (during barrovian metamorphism schist changes into gneiss)

glacial scratches

scratches on bare rock surfaces made when ice drags a large rock across the surface

stable platform

sediment deposited over the basement rock, flatter. Like the great plains.

shield

sediment scraped off by glaciers, basement rock exposed

how does the distribution of plants and animals in South America and Africa compare with that from 200mil years ago?

similar plant and animal fossils occur in South America and Africa prior to 200mil years ago but the continents have very different fossil assemblages after that time and their plant and animal species are quite distinct ex: glossopteris far continents share fossils but its not possible they were carried over an ocean so the continents had to be closer 200 mil years ago

Proxene Group

single chains of tetrahedra

Olivine Group

single tetrahedra

silicates structures

single tetrahedra are linked together to form various structures .

Esker

sinus ridges of outwash that collected in stream beds on the surface of a glacier, or beneath the glacier, and were left as ridges of stream gravel once the glacier melted

texture

size of crystal: coarse-grained fine-grained

what is the difference between slate and schist?

slate - very fined grained, dull, no minerals visible, prominent cleavage schist- mineral grains clearly visible, rich in micacaneous minerals(sparkly stuff) (both are foliated metamorphic),

What kind of cooling history do porphyritic textures indicate?

slow then fast

The higher a magma's viscosity is, the ____.

slower it will flow

Surface waves

slowest (Love and Raleigh waves) Cause the most damage, strongest waves

creep

slowest type of unconsolidated mass movement

Intrusive igneous rocks cool ___.

slowly

fumeroles

small gas release vents on the sides or flanks of a volcano that result from gas that migrate upward along fractures from a magma chamber beneath the volcano until it reaches the surface

Phyllte

small metamorphic mica crystals formed along thin foliation planes; gives the rock shiny, plastic-like appearance

distributes

smaller streams that receive water and sediments from the main channel, branch off downstream, and thus distribute the water and sediment into many channels

subsystems

smaller system that make up the big system. Hydrologic system, tectonic system, rock cycle, humans.

inner planets

smaller. earth, venus, mercury, mars

atoms

smallest particles of matter, retain all the characteristics of an element .

Bituminous

soft coal, 80 to 93% coarbon

inner core

solid

geosystems

specialized subsystems that produce specific types of activity, such as climate change or mountain building

Law of Cross Cutting

states that any feature that cuts across a rock or body of sediment must be younger than the rock or sediment that it cuts across

Cirques

steep circular headwalls at the tops of valleys

badlands topography

steep narrow zones of hummocky topography

volcanic dome

steep sided masses of vicious lava that may follow or precede explosive eruptions

horns

steep sided, faceted mountain peaks

Fjord

steep walled, deep estuaries where valleys meet the sea

Venifacts

stones polished and faceted by the wind

salt dome storage

storage for salt domes

geochemical reservoirs

storage of carbon and other chemicals linked by processes that transport chemicals among them

Disappearing Streams

stream or river that loses water as it flows downstream; the water goes underground

Drumlin

streamlined hills of glacially smoothed till or outwash

What feature is responsible for creating eskers?

streams that flowed below, in, or on the glacier

covalent bond

strong and hard, atoms share elections

ionic bond

strong bond, electron transferred between atoms,

rip tide

strong current, returns sand back to the ocean

what geological features are associated with convergent plate boundaries?

subduction zone/ earthquakes trenches volcanoes

According to the Intergovernmental Panel on Climate Change (IPCC), there is a 90-99% probability that increases in global temperatures are due to the increase in human-generated greenhouse gases.

t

Glaciers have the ability to record atmospheric composition through time.

t

Nitrogen is the most abundant gas in the atmosphere.

t

younger

the sedimentary layers above an erosive surface are _ relative to all rocks present below the surface

laminar flow

the simplest kind of fluid movement, straight or gently curved streamlines run parallel to one another without mixing or crossing between layers

creep

the slow gradual slip along a fault zone without major damaging earthquakes

larger

the slower the rate the ____ the crystals

atom

the smallest particle that retains the properties of a chemical element .made of protons, neutrons and electrons

what are unit cells?

the smallest repeat structures units within a crystal structure, they are able to repeat in 3D to create a solid mineral with length, width and height

Geosphere

the solid part of the earth consisting of the crust and outer mantle

Geology

the study of the Earth

continental shelf

the submerged margin of a continental mass extending from the shore to the first prominent slope, which usually occurs at a depth of about 120 m

Environment

the sum of all features and conditions surrounding an organism that may influence it. continually changing

mass wasting

the transfer of rock material downslope under the influence of gravity

high heat and pressure

the two most important driving forces of metamorphism?

asthenosphere

the upper layer of the earths mantle below the lithosphere, in which there is relative low resistance to plastic flow and convection is thought to occur

climate

the weather conditions prevailing in an area in general or over fa long period

Kaolinite

the white cream-colored clay produced by the weathering of feldspar

A scientific hypothesis that stands repeated testing can be elevated to a scientific

theory.

Sheetlike pluton

thick or thin tabular shape

what are the 3 most important radioactive elements?

thorium potassium uranium

Change in the ground elevation of Earth's surface is called

topography.

fossils

traces of organisms preserved in geological record

Lithification

transformation into solid rock.

Chemical

transformation of rock into one or more new compounds (decomposition) - most important agent is water

Sediment

transportation and deposition

greenhouse effect

trapping of heat in the atmosphere

true

true or false: The fossil record is biased toward preserving organisms with hard parts.

continental and oceanic.

two types of crust

Law of Unconformities

unconformity surfaces represent gaps in the geologic record that formed when layers were not deposited for a time or layers were removed by erosion

where is heat flow the highest?

under the mid ocean ridges

Continental crust

underlies the continents. Average thickness 35-40 km less dense

Oceanic crust

underlies the ocean basins. average thickness 7-10 km more dense

isometric

unit cells are cubes with side lengths a=b=c corner angles of 90,90,and 90 degrees ex: dice, sugar cube

orthorhombic

unit cells are rectangular prisms with sides a,b,&c of unequal lengths corner angles of 90,90,90 degrees ex: a book, door, cardboard box

What effect will an increased angle of tilt have on the Earth's climate?

warmer summers and colder winters

The melting of rock to form magma is influenced mainly by which of the following three factors?

water content temperature and pressure

9-10

water expands ____% upon freezing - > 25,000 psi

artesian flow

water moving through a confined aquifer

potable

water that tastes agreeable and is not dangerous to human health

precipitation

water vapors condense into tiny droplets of water that form clouds and eventually fall as rain or snow

Luster

way that light reflects from a mineral's surface

asthenosphere

weak sphere. is under the lithosphere is soft and weak

van der waals bonding

weakest, no transferring of electrons

Spheroidal weathering

weathering attacks a corner, face and edge on 2 sides

earth's surface

weathering, transport, deposition

the organism is burried quickly

what conditions favor fossil preservation?

wind glaciers rivers

what following agents move sediment from one place to another?

putting events in order from first to last

what is the definition of relative dating?

extrusive

what lava erupts at earth's surface, what type of rock is produced?

Diamond

what mineral is the hardest known substance in nature?

Proton and Neutrons

what particles take place in the nucleus?

cooling and solidification of magma

what process forms igneous rocks?

Silicon and oxygen

what two elements are found in all silicate minerals?

Ground motion(shaking)

what type of earthquake hazard breaks power lines, pipelines, buildings, roads, bridges, etc

outcrop

when a mass of crustal rock is exposed

outcrop

when a mass of crystal rock is exposed

Partial melting produces a magma that is more felsic than the source

when melting forms magma.

sedimentary rocks

when mineral crystals, clasts of plants, animals, mineral crystals, or rocks are compressed or naturally cemented together

liquefaction

when the ground becomes saturated with water, the planes of weakness within the solid material are lubrictaed, the friction between particles is lowered, and the particles or larger aggregates can move past one another more easily, so that the material may start ti flow like a fluid

What is seafloor spreading?

when the seafloor at the mid-oceanic ridge, moves horizontally away from the ridge axis toward the oceanic trench

Sedimentary rocks

• Sediments are derived from weathering of preexisting rocks • Sediments will lithify into sedimentary rocks • Accumulate in layers at Earth's surface

Melting is caused by:

◘Pressure release (mid ocean ridge) ◘Heat transfer (hotspot... mantle plume) ◘Volatile addition (island arc... subduction zone)