Earth's interior is made of several different layers.
Which problem does this model of Earth solve?
A. Finding out what makes up Earth's layers requires special tools.
B. Taking a picture of Earth's interior is impossible.
C. Earth's interior is very hot and too dangerous to study directly.
D. Earth's interior layers formed too long ago to observe directly.

Earth's interior is made of several different layers. Which problem does this model of Earth solve? A. Finding out what makes up Earth's layers requires special class=

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