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Internal Structure of the Earth

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How can scientists determine the internal structure of the Earth if they can't actually go there? The depth of the deepest mines and wells on Earth is only a tiny fraction of the earth's diameter. Describe one of the methods used to determine the inner structure of the Earth. Could similar methods be used on the planet Mars? How about the planet Jupiter?

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The expert examines internal structure of the Earth.

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Seismology, which is the science of analysis of sound waves in the Earth, is essentially the dominant source of knowledge about the Earth's internal structure.

Acoustic (sound) waves are partially reflected by boundaries between various layers due to the differences in the speed of the sound waves in different media. There are methods of detecting such echos by receivers spread over large areas, analyzing them, and deducing 3D images of structure deep underground.

Some acoustic waves are created by ...

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