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← GeographyWhich outcome occurs when oceanic plate subduction stalls?
A)Decreased buoyant magma upwelling.✓
B)Increased transform fault slipping.
C)Enhanced forearc basin sedimentation.
D)Reduced metamorphic rock exhumation.
💡 Explanation
A stalled subducting slab reduces asthenosphere convection; therefore buoyant magma upwelling decreases because slab-pull is absent and mantle flow weakens. Transform slippage will not systematically increase, rather than sedimentation changes. Metamorphic exhumation requires active collision.
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