Question

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How these P and S wave help to understand the structure of the earth?
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Answer 1

Answer:

P wave is the primary wave and S wave is the secondary wave.

Seismic waves from large earthquakes pass throughout the Earth. These waves contain vital information about the internal structure of the Earth. As seismic waves pass through the Earth, they are refracted, or bent, like rays of light bend when they pass though a glass prism.

Answer 2

Answer:

Although P-waves reappear, S-waves do not. ... Seismic waves from large earthquakes pass throughout the Earth. These waves contain vital information about the internal structure of the Earth. As seismic waves pass through the Earth, they are refracted, or bent, like rays of light bend when they pass though a glass prism.

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