Which downslope movement occurs when permafrost thaw increases soil moisture above sediment shear strength on a tundra slope?

💡 Explanation

When permafrost thaws, increased water saturation reduces soil shear strength because pore pressure increases while effective stress decreases, resulting in solifluction, gradual soil flow into lobes. Therefore solifluction lobe formation results, rather than terrace development, rock glacier slowing or talus reduction, related to different sediment processes.

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