Which outcome occurs when lahars deposit unconsolidated sediment?

💡 Explanation

Decreased groundwater inflitration occurs because lahar deposits compact pore spaces, therefore reducing permeability—the mechanism limiting fluid flow through strata—rather than increasing incision rates; infiltration is hindered rather than enhanced by hardened deposits.

• Which mechanism causes the formation of hanging valleys within a fjord's upper reaches?
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• Which risk increases when seasonal thawing of permafrost exceeds the structural capacity of soils?
• Which mechanism limits lake formation when downcutting rate exceeds sediment deposition in a fluvial valley?