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← GeographyWhich outcome occurs when rapid aggradation overwhelms a fluvial system forming an alluvial fan?
A)Channel avulsion redistributes sediment✓
B)Gradient reduction decreases stream ordering
C)Base level rises proportionally nearshore
D)Entrenched meanders increase path sinuosity
💡 Explanation
Channel avulsion is facilitated because increased sediment overwhelms the existing channel via aggradation by the alluvial fan; therefore, the river seeks steeper, more efficient paths rather than maintaining previous meanders.
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