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 soil horizon develops rapidly when vegetation cover expands?
• Which mechanism causes meandering stream morphology enhancement when vegetation is disrupted along riverbanks?
• Which outcome results when intense rainfall strikes thick loess deposits?
• Which process amplifies stream downcutting when tectonic uplift increases erosion rate?
• Which atmospheric effect causes increased rainfall on the windward side of mountain ranges aligned perpendicular to prevailing winds?
• Which effect increases phytoplankton concentration when coastal upwelling occurs?