Which condition reduces stability along over-steepened cirque walls?

💡 Explanation

Permafrost thaw weakens rock walls because it undergoes cryoturbation, the mechanism of ice expansion that destabilizes the rock mass; therefore, weakened layers retrogressively fail rather than remaining stable with less ice influence and mechanical structure.

• Which effect of the Coriolis force is most pronounced on large-scale wind patterns?
• Which circulation effect causes increased precipitation on the windward side of mountain ranges in coastal regions?
• Which mechanism amplifies volcanic explosivity when magma ascending through a subduction zone encounters groundwater near the surface?
• What geological outcome can be observed as soluble minerals are removed via percolating rainwater in soil?
• Which mechanism affects regional climate when thermohaline circulation weakens in the North Atlantic?
• Which localized outcome commonly occurs due to coastal upwelling?