Which process most directly shapes V-shaped valley into fjord after glacier retreat in coastal mountains?

💡 Explanation

When glacier retreats, isostatic rebound occurs because the removal of ice load allows the land to rise, and marine inundation floods the over-deepened U-shaped valley. Therefore, isostatic rebound leads to fjord formation, rather than glacial erosion, uplift, or chemical weathering, which shape terrain differently.

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