Discussion
Granite and rhyolite have the same composition but differ in
Answer: D
Correct answer: grain size, reflecting their cooling rates
The two are chemically identical: a granite is what a rhyolite magma becomes if it cools slowly at depth, and a rhyolite is what the same magma becomes if it erupts and chills at the surface. The difference is entirely one of crystal size, and the same pairing runs through the classification - diorite with andesite, gabbro with basalt.
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