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Geography

Which crustal response results from the ongoing subduction along megathrust boundaries?

A)Forearc basin sediment accumulation increase
B)Decreased volcanic arc eruption frequency
C)Rift valley expansion acceleration inland
D)Continental shield landmass stabilization initiation

💡 Explanation

Forearc basins accumulate sediment because the subducting plate scrapes material off the overriding plate in a process called accretionary wedge formation; therefore, sedimentation substantially expands there, rather than reducing volcanism via melt reduction.

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