Which process primarily drives cirque erosion deepening the basal region during glacial activity?

💡 Explanation

When glacial ice accumulates in a cirque, abrasion from rotational ice movement occurs because the ice mass grinds against the bedrock floor, deepening and widening the basin. Therefore abrasion is the primary driver of cirque deepening, rather than frost wedging, solifluction or chemical weathering which contribute more to headwall processes.

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• Which outcome occurs when increased pore water pressure?
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