________ are dissolved in melts at depth but they have a tendency to evolve and vaporize at lower (atmospheric)pressure and drive volcanic processes.
A)Crystals of quartz and feldspar
B)Silica, sodium, and potassium
C)Volatiles
D)Volcanic lavas

Question

Quizplus · Accepted Answer

Volatiles, such as water vapor, carbon dioxide, and sulfur dioxide, are dissolved in melts at depth but have a tendency to evolve and vaporize at lower pressures, driving volcanic processes. The other choices (A, B, and D) are not necessarily associated with the behavior of volatiles in magmas.

________ Are Dissolved in Melts at Depth but They Have