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.

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