Which process initiates headwall erosion to form distinct glacial cirques given seasonal freeze-thaw cycles?

💡 Explanation

When seasonal freeze-thaw act on a mountainside, nivation enhances erosion because snowpack accumulation accelerates weathering due to repeated freezing and thawing coupled with meltwater perculation. Therefore nivation results, rather than solifluction, artesian flow or glacial outburst which invoke different mechanisms and conditions.

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