Analyze the geomorphic characteristics and soil mechanics of mass wasting processes: Statement I: Solifluction is a slow, gravity-driven downslope movement of water-saturated soil lobes that occurs exclusively in periglacial environments underlain by permafrost. Statement II: Debris avalanches represent extremely rapid, chaotic flows of rock, soil, and vegetation mixed with water down steep mountain slopes. Which of the following is correct?

💡 Solution & Explanation

Statement I is incorrect because while solifluction is most prominent in periglacial regions, slow soil creep and gelifluction can also occur in non-permafrost sub-polar or alpine zones under seasonal freezing conditions. Statement II is correct as debris avalanches are violent, highly destructive mass wasting phenomena triggered by intense rainfall or seismic shaking. Slope stability analysis is critical for mitigating natural disaster risks in fragile mountain terrains.