________ is a volcanic rock that is extremely vesicular and glassy.
A) Obsidian
B) Pegmatite
C) Tuff
D) Pumice
Correct Answer:
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Q63: When a rock has a two-stage cooling
Q64: The aphanitic equivalent of peridotite is
A)komatiite
B)andesite
C)basalt
D)rhyolite
Q65: The phaneritic equivalent of basalt is
A)gabbro
B)granite
C)diorite
D)peridotite
Q66: Visible quartz and potassium feldspar grains are
Q67: Exceptionally coarse grained felsic plutonic rocks that
Q69: What is the rock colour (total %
Q70: The aphanitic equivalent of granite is
A)rhyolite
B)andesite
C)basalt
D)komatiite
Q71: When magma cools and consolidates without growth
Q72: What is the rock colour (total %
Q73: Which texture would be most unlikely to
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