Seismic waves traveling from a more dense rock to a less dense rock will have a LOWER in speed because these waves move very fast in denser medium.
Seismic waves travel more quickly through denser mediums and therefore it travel more quickly with depth because of more denser materials in the depth of the earth. Hot areas slow down seismic waves and these Seismic waves move more slowly through a liquid than a solid.
So we can conclude that Seismic waves traveling from a more dense rock to a less dense rock will have a LOWER in speed because these waves move very fast in denser medium.
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