Which outcome occurs when lahars block river channels?

💡 Explanation

Ephemeral volcanic lakes form due to lahar-induced channel blockage disrupting drainage via sediment deposition; this is due to fluvial flood pulses. Stable systems are unable to drain as, because stream base level rise due to material deposition, rather than glacier behavior or coastal sedimentation changes.

• Which outcome results when intensive agriculture reduces surface cohesion prior to wind events?
• Which consequence results when strong pressure gradients influence geostrophic wind balance?
• Which outcome occurs when excessive irrigation impacts caves?
• Which risk increases when hydraulic conductivity decreases within loess deposits?
• Which consequence results when glacial melt destabilizes permafrost earthflows bordering thermokarst lakes?
• Which outcome is most likely accompanying increased lahar flows down stratovolcano flanks?