What causes the sharp increases in the velocity of S waves at a depth of 400 and 660 km in the mantle?

Name: What causes the sharp increases in the velocity of S waves at a depth of 400 and 660 km in the mantle?
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The sharp increases in the velocity of S waves at depths of 400 and 660 km in the mantle are attributed to changes in the mineral structures. At these depths, the pressure conditions cause minerals to undergo phase transitions to denser structures, which allows S waves to travel faster.

What Causes the Sharp Increases in the Velocity of S