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← GeographyWhich outcome occurs after thawing permafrost undermines cirque headwalls?
A)Increased rockfall and arête degradation✓
B)Accelerated glacial till deposition rates
C)Enhanced soil horizon development phases
D)Stabilized bedrock weathering via cryoclasty
💡 Explanation
Increased rockfall and arête degradation occurs because thawing permafrost weakens the structural integrity via the mechanism of gelifluction, causing the headwall to collapse; therefore, cirque features erode rather than till deposits increasing because transport processes dominate.
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