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Geography

Which mechanism increases lahar risk following lava flows?

A)Glacial outburst flooding
B)Isostatic crustal rebound
C)Sublimation from ice fields
D)Liquefaction of alluvial fans

💡 Explanation

Lahar risk increases due to glacial outburst flooding, because lava flows melt glaciers rapidly feeding debris flows; The mechanism is increased surface runoff. Therefore, large lahars are produced rather than just typical melt water discharge due to the sudden volume increase.

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