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← GeographyWhich outcome develops when sediment supply exceeds transport capacity on a rapidly subsiding basin with proximal mountain uplift forming a braided stream?
A)Formation of an alluvial fan✓
B)Development of deeply incised canyon
C)Formation of a meandering channel
D)Development of an oxbow lake
💡 Explanation
Alluvial fans form via **aggradation** where excessive sediment deposition occurs, because stream power decreases rapidly as it enters a basin. Therefore a fan develops, rather than canyons or meandering streams that require different base levels and hydrologic regimes.
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