For example, in (Fig.3) as seismic waves travel deeper into the crust, they speed up. That means that at depth the rocks are denser. In the upper part of the mantle, the waves slow down.
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For example, in (Fig.3) as seismic waves travel deeper into the crust, they speed up. That means that at depth the rocks are denser. In the upper part of the mantle, the waves slow down.