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.


Answer: D

Environmental & Atmospheric Sciences

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A) 15 mb
B) 50%
C) 50 mb
D) 15%

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