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← GeographyWhich outcome occurs when a river's competence reduces significantly at the base of a mountain range, leading to deposition?
A)Formation of an alluvial fan✓
B)Increased river channel incision
C)Development of braided streams upstream
D)Creation of a deep V-shaped valley
💡 Explanation
An alluvial fan is created by sediment deposition. This occurs because reduced flow competence causes sediments to drop out of suspension via sedimentation, therefore creating coalescing fan-shaped deposits, rather than the river maintaining its carrying capacity.
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