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← GeographyWhich outcome occurs when the hydraulic gradient decreases sharply along a river flowing into a lake?
A)Alluvial fan deposition✓
B)Knickpoint migration begins
C)Dissolved oxygen concentration increase
D)Oxbow lake formation accelerated
💡 Explanation
Alluvial fan deposition occurs because sediment-transporting capacity diminishes significantly due to reduced stream gradient, hence the flow spreads and dumps its load. Therefore, deposition forms a fan shaped deposit, rather than channel incision, altered oxygen, or meander changes.
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