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Geography

Which risk increases within a fault-bounded basin when tectonic activity elevates surrounding mountains?

A)Accelerated alluvial fan sedimentation
B)Decreased floodplain soil fertility
C)Reduced regional aquifer recharge
D)Enhanced coastal dune stabilization

💡 Explanation

Increased tectonic uplift intensifies erosion, resulting in higher sediment yields entering the basin which accelerates alluvial fan aggradation because sediment transport capacity increases. Therefore, the fan expands rather than the floodplain improving soils, regional recharge increasing, or dune stabilization strengthening.

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