In an igneous rock with two distinct classes of crystal size, which of the following is true?
A) The rock cooled slowly at first, but then the cooling process speeded up.
B) The rock cooled quickly at first, but then the cooling process slowed down.
C) The minerals were all large, but then some melted.
D) There was an explosion producing different sized crystals.
Ans: A) The rock cooled slowly at first, but then the cooling process speeded up.
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