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.
A) True
B) False

The D layer is a transition zone between the solid portion of the lower mantle and the liquid outer core. Because S-waves only travel through solids, it has been hypothesized that a partially molten transition zone would affect the velocity of these S-waves by slowing them down considerably as the rock layer becomes less solid. The waves that are able to travel through a non-solid medium are the P-waves, which are more energetic than S-waves.

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. A) True B) False

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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.
A) True
B) False