A body of rock starts at location A in the graph below.The rock,over a period of time,moves to location B and begins to melt.This is an example of melting due to
A) fractional crystallization.
B) heat transfer.
C) addition of volatiles.
D) decompression.

Question

A body of rock starts at location A in the graph below.The rock,over a period of time,moves to location B and begins to melt.This is an example of melting due to 
A) fractional crystallization. 
B) heat transfer. 
C) addition of volatiles. 
D) decompression.

Quizplus · Accepted Answer

The movement of the rock from location A to B indicates a decrease in pressure or decompression. This decrease in pressure causes the rock to melt due to the reduction in confining pressure. Therefore, the correct answer is decompression.

A Body of Rock Starts at Location a in the Graph