Which process primarily drives downslope soil movement characteristic of solifluction within permafrost regions?

💡 Explanation

When temperatures fluctuate above and below freezing around permafrost, cyclical freeze-thaw action occurs because pore water expands upon freezing, weakening the soil structure and allowing it to flow downslope. Therefore cyclical freeze-thaw action is the primary driver of solifluction, rather than weathering and other related processes which change the composition physically and chemically.

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