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← GeographyWhich outcome is primarily caused by mantle upwelling when a subducting plate stalls?
A)Increased volcanic arc magma production
B)Formation of an oceanic island chain
C)Development of a back-arc spreading basin✓
D)Decreased regional metamorphic activity
💡 Explanation
A stalled subducting plate impedes slab rollback, causing upper mantle material to flow around the obstruction as corner flow; this divergence induces extensional forces and therefore creates a back-arc spreading basin, rather than increasing volcanism far above.
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