Which mechanism contributes to fjord formation during glacial retreat affecting isostatic crustal rebound?

💡 Explanation

When glaciers retreat, the abrasion caused by the moving ice deepens the existing valleys because the enormous pressure coupled with embedded rocks acts as a rasp, eroding the land surface. Therefore, abrasion actively deepening existing valleys helps carve out fjords rather than oxidation, erosion by rivers, or deposition, which operate through distinct mechanisms.

• Which mechanism causes significant elevation change after a megathrust earthquake near a coastline?
• Which mechanism impedes vertical nutrient replenishment within stable subtropical ocean gyres?
• Following months of increased stress, which outcome primarily results during stick-slip behavior along fault lines?
• Which outcome results when interseismic stress exceeds frictional strength along a subduction zone megathrust fault?
• Which process primarily controls sediment deposition and layering at the head of a fjord?
• Which risk increases when an earthquake causes liquefaction in an alluvial fan delta region supporting infrastructure?