How can scientists use data from an earthquake to learn about earth's layers? enter your answer in the space provided.

The answere to this question is

"Scientists can tell by observing the seismic waves that are recorded all over the surface of the earth from distant earthquakes. The seismic waves are reflected (bounced off) layers of different density, and they are refracted (bent) when they enter layers of different density."

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answer; (d) melting of sea ice;