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Which geological effect results from slab rollback during subduction?

A)Extension in the overriding plate
B)Increased crustal compression rates
C)Lithospheric thickening at ocean trenches
D)Decreasing magma viscosity near volcanoes

💡 Explanation

Slab rollback causes extension because the subducting plate sinks faster than the overriding plate can adjust; therefore, a back-arc basin opens, rather than compression which would require plate convergence dominated by frontal collision.

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