Which depositional outcome occurs where a deeply entrenched river emerges onto a broad alluvial plain?

💡 Explanation

An alluvial fan results from a rapid decrease in stream gradient causing sediment deposition via aggradation; therefore, the flow spreads out, rather than incising further because energy decreases, limiting erosion capacity.

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• Which adjustment occurs when alluvial river gradients decrease?
• Which increased risk occurs to structures founded atop loess deposits during prolonged saturation events?