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Which outcome occurs when a subducting plate stalls?

A)Increased volcanic arc magma viscosity
B)Accelerated mantle convection upwelling
C)Reduced forearc basin sediment subduction
D)Decreased frequency of megathrust earthquakes

💡 Explanation

A stalled subducting plate increases pressure in the mantle wedge, because corner flow continues bringing volatiles without the plate sinking; therefore partial melting increases volatile content and thus magma viscosity, rather than affecting convection or sediment transport rates.

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