Layers that are less dense, such as the crust<span>, float on layers that are denser, such as the mantle. Both </span>oceanic crust and continental crust<span> are less dense than the mantle, but </span>oceanic crust<span> is denser than </span>continental crust<span>. This is partly why the </span>continents <span>are at a higher elevation than the </span>ocean<span> floor.</span>
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Seismic waves are recorded by a machine called a seismograph, which tells us about the strength and speed of the seismic waves
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