Week 4: Life and Earth's Crust Answers

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1
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The crust’s role in _______ allows it to provide the raw materials necessary for life on earth.

A
the rock cycle
B
biogeochemical cycles
C
fossil fuel discovery
D
the water cycle
2
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The Mohorovicic discontinuity was discovered by monitoring the speed of seismic waves through Earth.

A
T
B
F
3

Crust and lithosphere refer to the same layer of the Earth.

A
T
B
F
4

Ocean ridges form as a result of _______.

A
slab pull
B
the upwelling of magma from the asthenosphere
C
sediment being deposited from the ocean
D
all of the above
5

Which of the following is true concerning continental crust?

A
It does not contain radioactive elements.
B
It mostly contains heavier and denser minerals than the mantle.
C
It efficiently transfers heat from the mantle to the surface.
D
None of the above
6

Earth’s crust sits on top of the mantle.

A
T
B
F
7

Which of the following best explains the importance of Earth’s crust to living organisms?

A
The continental crust allowed the evolution of life on land.
B
The crust provides raw materials necessary for life.
C
The crust allowed the formation of fossil fuels.
D
The rock cycle recycles sedimentary rocks formed from animal shells.
8

Where is oceanic crust thickest?

A
at mid-ocean ridges
B
in the center of ocean plains
C
at deep-sea trenches
D
none of the above
9

The Mohorovicic discontinuity is the _______.

A
division between the lithosphere and asthenosphere
B
boundary between solid and molten rock
C
transition from granitic to basaltic crust
D
boundary where crust gives way to mantle
10

Which layers of the Earth are common to both the compositional and mechanical descriptions?

A
crust and mantle
B
lithosphere and mesosphere
C
inner and outer core
D
crust and lithosphere

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