Which outcome causes expanding cirques in glaciated mountains?

💡 Explanation

Expanding cirques primarily result from nivation, where repeated freeze-thaw cycles weaken and erode the rock at the headwall because differential weathering exploits weaknesses rather than strictly abrasion. Headwall steepening results; therefore nivation enhances erosion rather than frost wedging's dispersed action.

• Which consequence results when tephra accumulation obstructs streams?
• Which process primarily controls soil composition after prolonged intense weathering?
• Which outcome occurs when localized tectonic uplift disrupts prevailing coastal current patterns?
• After magma ascends following substantial eruptions, which volcanic structure readily develops due to effusive activity?
• What wave action gradually causes toppling of coastal sea stacks?
• Which consequence results when local carbonic weathering exceeds saturation?