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How do scientists learn about Earth's interior?
What kind of waves tell them that there are different layers?

( please help, this assignment's due today )

User Fnisi
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Scientists use probes and pulses to learn about the earths interior.

Based on the penetration of the wave, scientists can know the density of the layers
User Renato Prado
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Scientists learn about Earth's interior by studying seismic waves. Seismic waves tell them that there are different layers.