The quartz in granite begins to melt at 650°C,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 25°C 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

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The Answer of The quartz in granite begins to melt at 650°C,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 25°C 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

The Quartz in Granite Begins to Melt at 650°C,so If