Which outcome typically results when tephra deposition buries valleys?

💡 Explanation

Lahars form because tephra deposition compacts valley fill; this triggers mass instability during rainfall, initiating volatile mudflows, therefore creating lahars rather than weathering or stabilization because water saturation drives sediment transport.

• Which risk intensifies when poorly consolidated alluvial sediments are saturated by heavy rainfall?
• Which risk increases when a descending oceanic plate accumulates volatile-rich sediments along a subduction zone?
• Which erosional outcome occurs where strike-slip motion terminates along transform boundaries between oceanic plates?
• Which outcome would result if Hadley cells weaken?
• Which outcome often occurs when differential stress builds along transform plate edges?
• Which process causes clay accumulation enhancing argillic horizons?