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 climatic effect results when volcanic aerosols remain suspended in atmosphere after large eruption?
• Which outcome occurs when a chain of volcanic islands interrupts deep ocean currents?
• Which mechanism drives upwelling along coastlines when Ekman transport moves surface water offshore?
• Which outcome reduces sand supply to beaches due to offshore breakwater construction?
• Which outcome is least likely as deposition shifts laterally on an alluvial fan constrained by uplift?
• Which geological phenomenon increases due to hotspot movement?