Which process limits the downcutting rate in cirques during glacial maximum?

💡 Explanation

When ice thickness increases beyond a threshold value, the enhanced pressure at the base results in a buoyancy effect that reduces the effective stress on the bedrock preventing further downcutting by abrasion. Therefore unloading limits erosion rates, rather than weathering, meltwater lubrication or ablation which enhance glacial erosion in less pronounced high-basal-pressure environments.

• Which outcome occurs when wind surpasses threshold for deflation?
• Which risk increases because excessive removal of vegetation occurs in permafrost regions?
• Which risk increases when saturated sediment underlies structures?
• Which mechanism maintains stable North Atlantic thermohaline circulation despite freshwater input from glacial melt?
• What increased geomorphological process results when vegetation is removed from an alluvial floodplain?
• Which fluvial outcome results as bend sinuosity increases?