Which risk dramatically increases after extensive tephra deposition?

💡 Explanation

Extensive tephra deposition sharply raises lahar risk because infiltration reduces soil cohesion, causing debris flows; therefore rainfall-induced lahars are very dangerous, rather than blast radius effects or deep underground phenomena.

• Which process primarily initiates cirque formation in glaciated alpine regions with pre-existing weaknesses?
• Which mechanism increases stream salinity when hydraulic fracturing occurs near shale deposits?
• Which consequence results when thermal stratification impedes vertical mixing in fjord streams?
• Which effect accelerates longshore drift when approaching headlands?
• Which mass wasting process is amplified within a cirque containing thawing permafrost?
• In a closed-basin desert lake, which process limits the maximum salt concentration?