Pegmatite refers to
A) an extremely coarse texture
B) an igneous rock body
C) a felsic composition
D) a mafic composition
E) A and C
Correct Answer:
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Q24: The viscosity of magma is dependent on
A)
Q25: Plutonic rocks
A) form below the surface of
Q26: Aphanitic, phaneritic and porphyritic are textural terms
Q27: Large crystals found in a fine-grained groundmass
Q28: Natural glass such as obsidian forms when
A)
Q30: Volcanic necks form when
A) the magma abruptly
Q31: A granite would form under conditions that
Q32: A basalt would form under conditions that
Q33: If early-formed crystals settled out of a
Q34: A porhyritic texture indicates that the rock
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