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← GeographyWhich deformation results when a subducting plate experiences dehydration?
A)Forearc basin subsidence intensifies rapidly✓
B)Mantle wedge melting temperature plummets
C)Frictional coupling along fault decreases
D)Magmatic arc volcanism rate decelerates
💡 Explanation
Forearc basins subside drastically because the crust becomes denser via metamorphic densification; dehydration releases fluids that trigger serpentinization, increasing density, therefore increased subsidence rather than mantle changes or volcanism changes driven by unrelated mechanisms.
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