A seismic wave will speed up when passing from the crust to the mantle because the mantle is made of ________.
A)granite
B)magma
C)peridotite
D)basalt

Question

Quizplus · Accepted Answer

The mantle is primarily composed of peridotite, which has a higher density and stiffness than the crustal rock types such as granite and basalt. The higher density and stiffness of the mantle allow seismic waves to travel faster through it than through the crust.

A Seismic Wave Will Speed Up When Passing from the Crust