Which geological action primarily dictates the depth profile morphology of fjords during interglacial periods?

💡 Explanation

When ice sheets retreat, differential isostatic rebound happens because thicker ice previously depressed the crust more at the fjord's center, leading to varying uplift rates and complex sill morphologies. Therefore, differing isostatic rates cause this profile, rather than deposition, sea level changes, or seimic activity which have lesser effects at fjord scale.

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