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Question
The quartz in granite begins to melt at 650oC, so if we find a migmatite where quartz has melted in a granitic rock and we know the temperature in the region increased with depth by about 25oC per kilometer, we could estimate the depth that the rock had been at to be about ________.A) 12.5 km
B) 18.0 km
C) 23.5 km
D) 26.0 km
Answer
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