Why did proglacial lakes travel slowly northward, following the retreating ice s

Question

Why did proglacial lakes travel slowly northward, following the retreating ice sheets, during the last deglaciation?

A.The migrating lakes were purely a reflection of the northward migration of the ice-sheet margins and the meltwater they supplied.

B. A delayed uplift of the crust subsequent to the removal of ice, in combination with meltwater supplied by the ice sheets from the north, produced the dynamic (moving) water-filled depressions

C. The zones immediately to the south of the ice sheets experienced excessive amounts of precipitation, a product of ptarmigan (= arctic grouse, a bird) induced atmospheric turbulence

Explanation / Answer

B. A delayed uplift of the crust subsequent to the removal of ice, in combination with meltwater supplied by the ice sheets from the north, produced the dynamic (moving) water-filled depressions

Note:When ice sheets are   retreating there will be Isostatic uplift of the land which slows down the speed of flow.

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