AnswersEarth and Space A 26-27Populations and the Environment

Earth's Interior Answers

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Which sources do scientists use to study the interior of Earth? Check all that apply.Earth’s orbitcore samplessea levelearthquakesS wavesrock composition

A
Earth’s orbit
B
core samples
C
sea level
D
earthquakes
E
S waves
F
rock composition
2
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Use the drop-down menus to select the part of Earth best described by each phrase.

Answers:
May help create Earth’s magnetic field:4
Can be thick or thin, depending on location:1
Made of molten metal:4
Selection 4:1
3

How do earthquakes help geologists understand Earth’s interior?

Answers:
During an earthquake, geologists use a machine called a to study seismic waves.:seismograph
P waves can pass through both solid and molten rock, but S waves can pass only through rock.:solid
4

molten ✔ solid tarry

A
molten
B
✔ solid
C
tarry
5

Which event would most likely occur if Earth did not retain the heat from its formation?

A
The inner core would liquefy.
B
Seismic waves would move the crust.
C
The Earth’s magnetic field would disappear.
D
The asthenosphere and outer core would solidify.
7

Which phrases are true of only the mantle? Check all that apply.made of three layershas a tarry layermade of two layershas a molten outer layerhas a solid outer layer

A
made of three layers
B
has a tarry layer
C
made of two layers
D
has a molten outer layer
E
has a solid outer layer
8

Use the drop-down menus to select the part of Earth best described by each phrase.

Answers:
May help create Earth’s magnetic field:4
Can be thick or thin, depending on location:1
Made of molten metal:4
Selection 4:1
9

✔ 123

A
✔ 1
B
2
C
3
10

2✔ 45

A
2
B
✔ 4
C
5
11

✔ 134

A
✔ 1
B
3
C
4
12

Why are the properties of the asthenosphere important? Check all that apply.The asthenosphere keeps Earth’s crust from getting too hot.Earth’s plates float on the denser asthenosphere.The depth of the asthenosphere keeps pressure on Earth’s core.The asthenosphere allows Earth’s crust to move.The asthenosphere creates Earth’s magnetic field.

A
The asthenosphere keeps Earth’s crust from getting too hot.
B
Earth’s plates float on the denser asthenosphere.
C
The depth of the asthenosphere keeps pressure on Earth’s core.
D
The asthenosphere allows Earth’s crust to move.
E
The asthenosphere creates Earth’s magnetic field.
14

You have learned that different types of rocks are found in Earth’s layers. Their composition affects their densities.What can you conclude based on the information in the table?

A
The rocks in the crust are the most dense.
B
The rocks in the upper mantle are the most dense.
C
The rocks in the lower mantle are the most dense.
D
The rocks in the core are the most dense.

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