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← GeographyWhich mechanism contributes to cirque formation in high-alpine environments with seasonal freeze-thaw cycles?
A)Frost wedging causing rock fracturing✓
B)Dissolution of carbonate bedrock
C)Deposition of glacial till
D)Abrasion by wind-blown sediment
💡 Explanation
When water penetrates cracks undergoes repeated freeze-thaw, frost wedging occurs because water expands upon freezing, exerting pressure that fractures the surrounding rock and loosening debris. Therefore rock fracturing results, rather than dissolution, till deposition, or wind abrasion each necessitating different environmental conditions.
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