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← GeographyWhich outcome occurs when mountain stream sediment delivery outpaces floodplain fluvial erosion?
A)Development of an alluvial fan✓
B)Oxbow lake formation acceleration
C)Meander cut-off stabilization rate decrease
D)Braided channel sedimentation increase
💡 Explanation
Alluvial fans develop because sediment deposition exceeds fluvial erosion; therefore, the stream builds outwards rather than laterally eroding its banks. Channel avulsion enables continued deposition; rather than lake formation or cut-off, the slope promotes deposition and alluvial expansion.
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