Multiple Choice
_________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) Volatiles
C) Silica, sodium, and potassium
D) Volcanic lavas
Correct Answer:
Verified
Correct Answer:
Verified
Q16: A _ is a near surface, intrusive,
Q17: Which of the following best describes the
Q18: Visible quartz and potassium feldspar grains are
Q19: Intermediate rocks like andesite and diorite _.<br>A)
Q20: The earliest formed crystals (phenocrysts) in a
Q22: Which of the following is the dominant
Q23: Mafic rocks like basalt and gabbro_ .<br>A)
Q24: Which of the following igneous rocks usually
Q25: Plutonic rocks are emplaced at depth yet
Q26: The aphanitic equivalent of diorite is<br>A) basalt<br>B)