What outcome occurs when differential erosion acts on cirques?

💡 Explanation

Arêtes and horns form because differential erosion via ice plucking and abrasion erodes cirque headwalls and divides; increased erosion forms sharp, high-relief ridges (arêtes) and pointed peaks (horns) rather than widespread deposition because the primary driver is erosion by ice.

• Which risk dramatically increases after extensive tephra deposition?
• Which risk increases when construction on permafrost causes thaw and subsequent subsidence?
• Which risk increases when the orographic effect intensifies wind flow?
• Which outcome results from limited sediment supply during aeolian deflation?
• Which process predominantly controls the salinity stratification in meromictic lakes?
• Which climatic consequence occurs when a major volcanic eruption disrupts the North Atlantic subpolar gyre?