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How do scientists know the characteristics of each layer of the Earth?
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How do scientists know the characteristics of each layer of the Earth?

User Schottky
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Answer:

Scientist know the characteristics of each layer of Earth because of P-waves and S-waves these waves are caused by earthquakes. A seismograph can record the waves and give us a layout of earths interior because the waves change frequency when they pass through certain objects.

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User DaveS
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