Section #: 20.1
Crust-Mantle Relationships
Practice Test
1.
The roots of a mountain are __________.
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a.
always as deep as the mountain is high
b.
always the same depth as the mountain is high
c.
often many times deeper than the mountain is high
d.
often shallower than the mountain is high
2.
Continental crust is made mostly of __________ and oceanic crust is made mostly of __________.
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a.
grabbo, basalt
b.
basalt, granite
c.
granite, basalt
d.
granite, rhyolite
3.
What is isostasy?
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a.
mantle material upwelling around crustal material because of gravity
b.
equilibrium that has been established between continental and oceanic crust
c.
Continental crust floats on top of oceanic crust.
d.
Continental and oceanic crust displace the mantle, so they are in equilibrium.
Hint
4.
Why does continental crust rise higher above the surface of Earth than oceanic crust?
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a.
Continental crust is thicker and is less dense.
b.
Continental crust is thinner and less dense.
c.
Continental crust is less dense than the mantle.
d.
Oceanic crust is under continental crust.
Hint
5.
What are two main elevation modes on Earth?
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a.
4 km to 5 km above sea level
b.
1 km to 4 km above sea level
c.
0 km to 1 km above sea level and 4 km to 5 km below sea level
d.
4 km to 5 km above sea level and 0 km to 1 km below sea level
Hint
6.
Using the map, infer where the highest elevations are in the U.S.
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a.
in the center of the country
b.
in the western states
c.
in the northeastern states
d.
in the south, along the Florida coast
Hint
