Chapter 20 Earth and space 11th grade

the larges percentage of Earth's surface aboce sea level ranges in elevation from 0 km to ______.

1 km

Approximately how much of Earth's surface is above sea level?

30 percent

What is the approximate percentage of the Earth's surface that is covered by continents?

30 percent

How far below sea level is the largest percentage of Earth's surface?

4-5 km

Approximately how much of Earth's surface is below sea leavel?

70 percent

Which is NOT one of the seven major mountain belts?

African Crest

Some of the rocks and structures in this region are like those in the Appalachian Mountains

Europe

t/f: Most of Earth's surface is aboce sea level

False

t/f: Ocean ridges from at convergent plate boundaries

False

t/f: Orogenic forces refers to the rising of the crust when a large amount of mass is removed?

False

t/f: Orogeny is a term that refers to all processes that from Earth's crust

False

t/f: The Appalachian mountains are an example of divergent-boundary mountains

False

t/f: The Himalayas are older than the Appalachian Mountains

False

t/f: The volcanoes of an island arc complex form as a result of oceanic-contiental convergence

False

t/f: When mountains erode, their roots increase in size

False

t/f: individual volcanic mountains on the ocean floor are called plates

False

t/f: the variation in elevation of crust is call geography

False

Ancestral North America and ancestral Africa collided to from this supercontinent

Pangea

t/f: About 70 percent of earth's surface is below sea level

True

t/f: Continents are said to float on Earth's mantle

True

t/f: Isostasy is an equilibrium between gravitational force and buoyant force

True

t/f: Many mountain ranges are formed as the result of tectonic interactions

True

t/f: Mt. Everest is the tallest mountain on Earth, so it probably has the deepest root

True

t/f: Oceanic crust is made mainly of basalt, and continental crust is made mainly of granite

True

t/f: The mantle has a greater density than continental crust

True

t/f: The tallest orogenic belts are found at continental-continental convergent boundaries

True

In the diagram, what associated letter depicts the divergent plates?

a

In the diagram, what associated letter depicts the central rift?

b

Oceanic crust is made of ___.

basalt and is denser than continental crust

Subduction zones form at _____.

both oceanic-oceanic and oceanic-continental boundaries

In the diagram, what associated letter depicts cold, dense, oceanic crust?

c

FORCES that squeeze the crust, causing deformation

compressive FORCES

Which lists Earth materials in order of increasing density?

continental crust, oceanic crust, mantle

the Himalayas formed as the result of ____.

continental-continental covergence

at which type of plate boundary do the hightest mountains form?

covergent; continental-continental

in the diagram, what associated letter depicts magma?

d

Which cause differences in elevation of Earth?

density and thinkness of the crust

Which would be most useful in predicting the amount of mantle a volume of crust will displace?

density of the crust, continental crust, oceanic crust, mantle

At this boundary, the lithosphere bulges up and is higher than the surrounding oceanic crust

divergent boundaries

in the diagram, what associated letter depicts an ocean ridge?

e

Isostasy is a(n) ______. between the mass of Earth's crust and the Buoyance of the mantle

equilibrium

Mountains that form when large pieces of crust are tilted, uplifted, or dropped between faults.

fault-block mountains

Fault-block mountains ______.

form when a large pieces of crust drop between large fault rises

Uplifte mountains ____.

form when a large region of Earth's crust rises up as a unit have rocks that are not very deformed are the result of erosional forces

The volcanic peaks of Hawaii formed as a result of this

hot spot

As material is removed from mountains by erosion, the crust slowly rises. This process is ____.

isostatic rebound

Slow process of the crust's rising after overlying material is removed/

isostatic rebound

After millions of years of erosion, the Appalachian Mountains still exist because of _____.

isotatic rebound

Which is not associated with orogeny at covergent boundaries?

ocean ridges

During ocean-ocean convergence, where do island arc volcanoes form?

on the plate that is not subducted

Cycle of processes that form mountain ranges

orogeny

Large, flat-tropped, uplifted area

plateau

Whit isotatic rebound, mountains tops are eroded while the crust below them ______.

rises

What is continental crust that extends into the mantle?

root

Topographic highs in the crust have deep ____. that extend to the mantle and provide buoyance

roots

What purpose do mountain roots serve?

serve as a counterbalance to the large weight above

A good model for isotasy is _____.

the water line of a boat when someone boards or leave it.

What is a type of mountain that often shows little deformation?

uplifted

Mountains that form when large regions of Earth experience upward movement

uplifted mountains