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← GeographyWhich process causes cirque widening beyond normal weathering thresholds after glacier retreat?
A)Isostatic rebound increasing rock fracture
B)Permafrost thawing triggering rockfalls✓
C)Increased vegetation stabilizing slopes
D)Aeolian deposition cementing loose sediment
💡 Explanation
When glaciers retreat, previously frozen ground (permafrost) around the cirque thaws, causing slope destabilization and increased rates of rockfall due to freeze-thaw weathering and reduced soil cohesion. Therefore permafrost thawing causes cirque widening, rather than rebound, stabilization, or cementation which counteract erosion forces.
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