AnswersEarth and Space ScienceEarth's Crust and Mantle

Earth's Crust and Mantle — Quiz Answers

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1
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A team uses seismic and heat flow data to predict future crustal deformation. Which layer should they study, and why?

A
outer core, because it causes mantle to cool
B
lithosphere, because it's the source of all magma
C
asthenosphere, because its flow drives tectonic activity
D
crust, because it creates Earth's magnetic field
2
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Match each term to its definition.

Answer:

rising crust caused by tectonic collisions|a force resulting from plates pushing crust together|the accumulation of crust at collision zones

3

Which interaction between Earth's crust and mantle helps form mountain ranges like the Himalayas?

A
The cooling of crustal plates causes shrinkage.
B
Two continental plates collide, pushing crust upward.
C
The mantle melts, dissolving nearby crust.
D
Oceanic crust rises into the atmosphere.
4

Which statement best explains why oceanic-oceanic collisions do not form high mountains like continental-continental collisions?

A
Ocean currents and waves keep eroding the mountains.
B
Oceanic crust is too thin and dense to uplift.
C
Oceanic plates float higher on the mantle.
D
Oceanic crust is too thick to form a mountain.
5

Choose the correct answer from each drop-down menu to complete the statement. The [Dropdown 1] is the boundary that separates the crust from the mantle and is identified by a change in [Dropdown 2] due to a shift in material properties.

Answer:

Moho|seismic wave speed

6

Which statement best explains the physical properties of the asthenosphere and mesosphere?

A
The asthenosphere is part of the lower mantle, while the mesosphere is part of the upper mantle.
B
The asthenosphere behaves as a rigid solid, while the mesosphere flows slowly.
C
Both layers are identical in structure and help generate Earth's magnetic field.
D
The asthenosphere allows plate movement, whereas the mesosphere remains rigid.
8

What happens to an oceanic plate during a collision with a continental plate?

A
It subducts into the mantle.
B
It remains stationary as the continental plate buckles.
C
It forms a new crust above the continental plate.
D
It floats above the continental plate.
9

What is the main cause of mantle convection that drives plate movement?

A
friction from the Earth's rotation
B
uneven solar heating of the surface
C
movement of the magnetic field
D
differences in temperature and density inside the mantle
10

Choose the correct answer from each drop-down menu to complete the statement. The [Dropdown 1] is broken into large plates that move slowly over the [Dropdown 2] , a softer, flowing layer that allows Earth's surface to change over time.

Answer:

lithosphere|asthenosphere

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