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← GeographyWhich outcome consistently follows increased crustal downwarping above subduction zones?
A)Increased flux melting in the mantle✓
B)Decreased regional metamorphic grade
C)Expanded rain shadow desert formation
D)Accelerated post-glacial isostatic rebound
💡 Explanation
Increased crustal downwarping intensifies pressure and temperature, thus water is released; this then triggers flux melting of the mantle wedge. The increased melt production leads to more volcanism, therefore increased flux melting better explains this process rather than isostatic rebound due to ice melting.
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