Which mechanism accelerates headwall erosion within a glacial cirque containing a bergschrund?

💡 Explanation

When meltwater penetrates the bergschrund, cryogenic weathering occurs because repeated freeze-thaw cycles widen cracks and fractures in the rock, leading to detachment of rock masses from the headwall. Therefore, cryogenic weathering accelerates erosion, rather than abrasion, dissolution, or plucking which depend on different physical processes and glacial bed conditions.

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