Which process causes the headwall of a cirque to steepen, leading to eventual enlargement?

💡 Explanation

When water freezes in bedrock fractures, frost wedging expands the cracks because ice has a larger volume than liquid water. Glacial plucking then removes loosened rocks. Therefore frost wedging coupled with glacial plucking steepens the cirque headwall, rather than chemical weathering, tectonic uplift, or sediment deposition which involve different mechanisms.

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