Multiple Choice
Aphanitic, phaneritic and porphyritic are textural terms which
A) refer to fine-grained, course-grained and mixed grained crystal sizes, respectively.
B) form from slow cooling, fast cooling, and mixed cooling rates, respectively.
C) are indicative of volcanic, plutonic and mixed plutonic-volcanic origins, respectively.
D) A and C
E) all of the above
Correct Answer:
Verified
Correct Answer:
Verified
Q51: What is the rock name for a
Q52: When magma cools slowly, crystal growth (slows/speeds)_
Q53: What are the two main categories of
Q54: Phaneritic textures indicate that the rock formed
Q55: Mafic magma is silica poor and may
Q57: Why can pegmatite mineral crystals reach such
Q58: Pegmatites are composed of very large crystals
Q59: Viscosity of a magma provides an indication
Q60: Magma chambers generally exist at depths of
Q61: Porphyritic textures suggest a complex cooling and