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← GeographyWhich outcome is caused by increased mantle hydration?
A)Lowered melting point of mantle rock✓
B)Increased plate boundary shear stress
C)Decreased subduction zone earthquake frequency
D)Elevated continental crust density averages
💡 Explanation
The addition of water deep in a subduction zone lowers the mantle rock's melting point by flux melting, because water weakens the bonds there; therefore, magma generation rates at volcanoes increase, rather than the other outcomes.
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