What causes the sharp increases in the velocity of S waves at 400 and 670 kilometers depth in the mantle?

Name: What causes the sharp increases in the velocity of S waves at 400 and 670 kilometers depth in the mantle?
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The sharp increases in the velocity of S waves at 400 and 670 kilometers depth in the mantle are caused by changes in the mineral structures of the mantle. At these depths, there are phase changes in the minerals which cause the S waves to travel faster through the mantle.

What Causes the Sharp Increases in the Velocity of S