Which outcome results when tephra deposition overwhelms drainage systems?

💡 Explanation

Lahar formation occurs due to tephra blocking drainages, resulting in debris and water mixing rapidly; this is debris flow mobilisation. The increased sediment load raises pore pressure, therefore saturated tephra destabilizes, rather than ice recrystallization or impacting atmospheric conditions.

• Which mechanism creates increased salinity near desert stream outflows?
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• Which outcome reduces coastal wetland health when sand accumulates?
• Which outcome sharply increases when newly formed volcanic islands experience high rainfall?
• Which mechanism explains sediment layering in glacially-formed proglacial lakes with seasonal meltwater inflow?