Which risk increases when a stratovolcano's conduit collapses?

💡 Explanation

Increased pyroclastic flow speed results from debris avalanche causing lateral blast because depressurization causes gases to violently expand; therefore a stronger and faster lateral flow results, rather than increased tephra because the main vent is blocked.

• Which consequence results when a lava dome's cooling rate decreases?
• Which directional shift results from prevailing winds crossing extended mountain ranges?
• Which risk increases when a cirque's bergschrund melts?
• Which geophysical event is most likely to occur along coastlines as permafrost thaws due to rising global temperatures?
• Which mechanism causes increased stream meandering downstream when floodplain gradient decreases?
• Which outcome increases when meltwater volume rises within a cirque?