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← GeographyWhich outcome occurs when sediment load exceeds stream capacity at mountain base?
A)Formation alluvial fan deposition plain✓
B)Incised meanders in bedrock develop
C)Delta formation within confined estuary
D)Braided streams within wide valleys
💡 Explanation
Alluvial fan deposition occurs because sediment sorting reduces transport capacity where a mountain stream exits the steep slope; therefore, the reduced energy causes abrupt deposition rather than continued channelized downcutting seen when stream retains capacity.
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