In the D" layer, the portion of the mantle closest to the core-mantle Boundary is hypothesized to be partially melted because the S-wave velocities decrease by 30% when passing through it.

Question

Quizplus · Accepted Answer

The decrease in S-wave velocities in the D" layer is indicative of partial melting, which leads to the hypothesis that this portion of the mantle is partially melted.

In the D" Layer, the Portion of the Mantle Closest