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