melting and crystallization

Amherst College Department of Geology MELTING AND CRYSTALLIZATION Review your class notes and consider Figures 6.3 and 6.4 from your textbook (reproduced below). Write a brief (one paragraph) explanation of why the mantle undergoes partial melting when it rises (decompresses) yet continental crust melts when it is buried (subjected to greater pressure). From this context, proceed with a brief (one paragraph) explanation of why granites and basalts are common but rhyolites and gabbros are rare.

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Amherst College Department of Geology

MELTING AND CRYSTALLIZATION

Review your class notes and consider Figures 6.3 and 6.4 from your textbook (reproduced below). Write a brief (one paragraph) explanation of why the mantle undergoes partial melting when it rises (decompresses) yet continental crust melts when it is buried (subjected to greater pressure). From this context, proceed with a brief (one paragraph) explanation of why granites and basalts are common but rhyolites and gabbros are rare.

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