Select the choice below that best describes the role of volatiles in an ascending magma.
A)Volatiles increase the rate of crystallization in intrusive structures.
B)Volatiles will force the magma to contract as it rises.
C)Volatiles will shatter surrounding rocks, making it easier for the magma to rise.
D)Volatiles will expand with decreasing pressure, then melt upward.

Question

Quizplus · Accepted Answer

Volatiles, such as water vapor and carbon dioxide, will expand with decreasing pressure as the magma rises towards the surface. This expansion can cause the magma to become more buoyant and ultimately erupt as a volcanic eruption.

Select the Choice Below That Best Describes the Role of Volatiles