Which lake-forming outcome occurs when accumulated tephra redirects stream flow?

💡 Explanation

Alluvial fan development leads to lake formation because sediment accumulation, influenced by tephra deposition, redirects water flow, creating a barrier and impounding water upstream; therefore, alluvial fan damming is the outcome, rather than glacial or isostatic processes.

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• Which risk increases when a cutoff process shortens a fluvial meander?
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• Which outcome occurs when a coastal megathrust fault ruptures during an earthquake?
• Which consequence results when decreased flood frequency occurs in an alluvial river system?
• Which outcome accelerates cliff retreat weathering when wave approach weakens the fault?