Question

If the temperature of rock in the mantle remains constant but the pressure decreases, what will happen?
A. The rock will sink into the mantle, forming new asthenosphere.


B. The rock will become solid, forming new crust.


C. The rock will melt, forming magma.


D. The rock will rise to the surface, forming new crust.

Answer 1

I would think the answer is c if not I'm so sorry 

Answer 2

ANSWER:

(C) The rock will melt, forming magma.

EXPLANATION:

If the temperature of rock in the mantle remains constant but the pressure decreases, then the rock will melt and will ultimately form magma. This process is known as decompression melting. The reduced pressure of the rocks indirectly lowers the melting point of the rock. This causes the rock to melt and change its state from solid to liquid.