AnswersEarth and Space A 26-27Earth's Interior

Earth's Interior Answers

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1
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Study the diagram about the varying pressures of Earth’s Layers.

Question illustration
A
outer core
B
inner core
C
lithosphere
D
oceanic crust
2
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Which statement describes a characteristic of the asthenosphere?

A
Temperatures are cool.
B
Consistency is solid.
C
Thickness is less than crust.
D
Pressure is higher than crust.
3

Which statement describes how the mantle is similar to Earth’s oceanic crust?

A
It is composed mostly of basalt.
B
It consists primarily of molten rock.
C
It has varying degrees of thickness.
D
It is divided into two layers.
4

Study the images of Earth’s crust and mantle in two different areas.How is Item A different from Item B?

Question illustration
A
The crust under the ocean in Item A is thicker than the crust under the mountain in Item B.
B
The mantle under the ocean in Item A is thinner than the mantle under the mountain in Item B.
C
The crust in Item A is found partially below sea level as compared to the crust in Item B.
D
The mantle in Item A is located far below a mountain as compared to the mantle in Item B.
5

Study the image of a seismic graph.About how far does the S wave travel through Earth in 13 minutes?

Question illustration
A
2,000 km
B
4,000 km
C
6,000 km
D
8,000 km
6

Which object can an S wave travel through?

A
air
B
magma
C
soil
D
water
7

Which layer of Earth experiences the least amount of pressure?

A
crust
B
mantle
C
outer core
D
inner core
8

Study the graph about seismic waves.What does the graph show?

Question illustration
A
The S and P waves travel the same distance through Earth’s crust in the same amount of time.
B
The P wave travels through Earth’s crust more quickly than the S wave travels.
C
It takes the P wave 18 minutes to travel 6,000 km through Earth’s crust.
D
It takes the S wave 11 minutes to travel 8,000 km through Earth’s crust.
9

The composition of rocks affects their densities and the densities of Earth’s layers. Use what you have learned and the information in the table to answer the question.In which order would these rocks and minerals be found in the layers of Earth from the crust to the lower mantle?

Question illustration
A
eclogite, perovskite, rhyolite, stishovite
B
stishovite, rhyolite, perovskite, eclogite
C
stishovite, perovskite, eclogite, rhyolite
D
rhyolite, eclogite, perovskite, stishovite
10

Why is Earth's outer core hotter than Earth’s oceanic crust?

A
Earth’s oceanic crust is denser than Earth’s outer core is.
B
Earth’s oceanic crust has lava flowing from the mantle.
C
Earth’s outer core has a composition of solid iron and nickel.
D
Earth’s outer core is deeper within Earth than oceanic crust is.

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