Volcanic necks form when
A) the magma abruptly cools into a solid rock column during the initial eruption
B) the eruptive material is eroded from the flanks of the volcanic pipe
C) dikes are exposed at earth's surface
D) lava fountains cool on steep volcanic slopes
E) the country rock surrounding a small stock is eroded
Correct Answer:
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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)
Q29: Pegmatite refers to
A) an extremely coarse texture
B)
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
Q35: Batholiths typically contain
A) phaneritic rocks composed predominantly
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