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← GeographyWhich lake formation occurs when sediment deposition constricts flow?
A)Braided stream channel formation
B)Alluvial fan lake formation✓
C)Terminal moraine depression filling
D)Glacial kettle subsidence linking
💡 Explanation
Alluvial fans form lakes via **sediment aggradation**, because sediment deposition blocks drainage pathways, therefore impounding water. Fan lakes form because restricted outflow creates new water bodies, rather than sorted sediment profiles or glacial influence.
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