Life and Earth's Crust Answers

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1
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The Earth’s crust is principally composed of _______.

A
granitic and sedimentary minerals
B
granitic and basaltic minerals
C
basaltic and sedimentary minerals
D
none of the above
2
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Explain what differentiates the Earth’s crust and lithosphere.

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3

Rheology is best described as the study of _______.

A
the flow of matter
B
the Earth’s crust
C
magma
D
the Earth’s core
4

Explain how biogeochemical cycles and the rock cycle are important for life on Earth.

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5

The continental crust covers _______ of the Earth’s surface.

A
40%
B
50%
C
60%
D
70%
6

Explain how fossil fuels found in the Earth’s crust are ultimately the result of biological processes.

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7

The core of the Earth is mostly composed of _______.

A
magnesium and silicon
B
aluminum and silicon
C
nickel and iron
D
aluminum and iron
8

Explain how oceanic crust is continuously created at mid-ocean ridges.

Answer not available
9

Explain how ocean ridges and trenches are formed.

Answer not available
10

Which of the following best describes the compositional layers of the earth?

A
All layers of the Earth below the crust are liquid.
B
The only liquid layer of the earth is the mantle.
C
The crust floats on top of the outer core.
D
Some layers of the earth are liquid, and some are solid.

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