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← GeographyWhich process drives deep mantle upwelling due to subduction?
A)Slab rollback inducing mantle flow✓
B)Core-mantle boundary heat conduction alone
C)Crustal delamination directly buoyancy driven
D)Trench suction from overriding plate motion
💡 Explanation
Slab rollback causes deep mantle upwelling because the subducting slab sinks faster than the overriding plate advances; therefore, the mantle flows to fill the void, rather than upwelling being driven solely by thermal effects.
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