Which process is accelerated by freeze-thaw weathering acting on a cirque headwall?

💡 Explanation

When moisture seeps into cracks in a cirque headwall, repeated freeze-thaw cycles cause frost wedging and nivation as ice crystal growth breaks down the rock because expansion of ice exerts pressure. Therefore expansion by nivation results rather than roche moutonnées, striations, or eskers, as these require glacial ice flow, glacial abrasion of the bed rock at the base, or meltwater depositing material within tunnels under the glacier respectfully.

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