Which process primarily accelerates cirque formation at high altitudes due to increased freeze thaw weathering?

💡 Explanation

When temperatures fluctuate around freezing at high altitudes, nivation processes dominate because meltwater penetrates cracks in bedrock behind the Bergschrund, refreezing and expanding causing rock fracturing. Therefore the focused freeze-thaw activity due to nivation accelerates cirque formation, rather than sliding, abrasion or creep which depend on different thermal and stress conditions.

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