Which process enhances cirque formation when freeze-thaw cycles act on fractured bedrock within a glacial environment?

💡 Explanation

When freeze-thaw cycles act on fractured bedrock, nivation occurs because the repeated freezing and thawing of water in the cracks expands the rock, breaking it down over time, creating the initial hollow needed for cirque development. Therefore nivation enhances cirque formation, rather than orogenic uplift, chemical weathering, or aeolian erosion, needing tectonic or long time spans.

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