Multiple Choice
Large crystals found in a fine-grained groundmass can indicate
A) origin from a magma with an early intrusive phase followed by an extrusive phase.
B) origin from a magma with an early extrusive phase followed by an intrusive phase.
C) a rock of mixed volcanic-plutonic origin.
D) A or B
E) A and C
Correct Answer:
Verified
Correct Answer:
Verified
Q36: Relative to the emplacement and exposure of
Q37: The viscosity of magma is dependent on<br>A)
Q38: Basalts are common_ trusive rocks in the
Q39: Dikes are concordant and sills are discordant.
Q40: Melting of crustal rocks produces silica-rich magmas.
Q42: Magma composition may change by crystal settling.
Q43: Most batholiths are of what rock composition?
Q44: The discontinuous branch of Bowmen's reaction series
Q45: What is the evidence of forceful injection
Q46: Felsic lavas would tend to be slow