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Answer :

The study of the earth is known as geography .

Scientists are able to understand Earth's interior by studying seismic waves. ... Seismic waves are recorded by a machine called a seismograph, which tells us about the strength and speed of the seismic waves. These recordings made by a seismograph are called seismograms.
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Answer:

Scientists use waves to study the different layers of the earth. Usually, they use seismic waves, which are waves generated by earthquakes or nuclear-test explosions. The seismic waves are bent, sped up, slowed down, or even reflected when they pass through the earth's layers.

Explanation:

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