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:
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Q22: Magma that is forcefully ejected into the
Q23: A magma composed of more than 65%
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
Q28: Natural glass such as obsidian forms when
A)
Q29: Pegmatite refers to
A) an extremely coarse texture
B)
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
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