The observations of the scientists lead to the conclusion that there may be denser layers and empty caverns deep inside the Earth's crust.
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What is the Explanation?</h3>
The Earth's surface is covered with layers that are noticeably dense. While some strata have a relatively low density, others have a very high density.
Through layers of various densities, seismic waves move at various rates.
Even when they pass through some layers, these waves vanish. This enables researchers to reach sound and trustworthy findings regarding how the Earth's interior was formed.
To learn more about the earth's crust visit:
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