Which effect intensifies when freeze-thaw cycles erode bedrock within a glacial cirque?

💡 Explanation

When freeze-thaw cycles occur within a cirque, ice exerts pressure, which widens existing cracks, causing rock fragmentation and removal due to frost weathering; hence accelerated headwall steepening. Therefore cirque headwall erosion accelerates, rather than flour production changes, basal sliding changes, permafrost expansion which rely on different mechanisms like glacial abrasion.

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