Which process primarily drives the formation of a deep fjord from a pre-existing U-shaped glacial valley?

A)Isostatic rebound from glacial unloading

B)Marine transgression due to rising sea level✓

C)Differential weathering from saline intrusion

D)Sediment deposition altering river drainage

💡 Explanation

When sea level rises, marine transgression occurs as the ocean floods the previously glaciated valley because glacial erosion left it deeper than the current sea level. Therefore a fjord results, rather than rebound, weathering, or river alteration, each from substantially different causes.

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Which process primarily drives the formation of a deep fjord from a pre-existing U-shaped glacial valley?

💡 Explanation

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