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← GeographyWhich 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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