Which outcome occurs when sediment supply exceeds stream transport capacity in an arid mountain watershed?

💡 Explanation

An alluvial fan forms because excessive sediment load overwhelming fluvial transport results in deposition where the stream exits the constricted mountain valley. Therefore, an alluvial fan develops, rather than a meandering pattern or braiding, which occurs under different flow dynamics.

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• Which outcome reduces primary productivity when deep-water upwelling weakens?
• Which threat increases when levees confine a meandering river within a narrow floodplain?
• Which outcome occurs when basalt bedrock underlies tropical rainforest?