How does the principle of isostatic rebound apply to Hudson Bay? What will be an ideal response?
Hudson Bay was the center of the North American ice sheet during past glacial episodes. This was the
area where ice was thickest and hence heaviest. The weight of that ice depressed the lithosphere
beneath it to below sea level. The evidence for this is the existence of Hudson Bay itself, which lies
well within the interior of the continent. Melting of the ice was sudden, in the sense that it happened
faster than the underlying lithosphere could elastically adjust. This adjustment, or rebound, is still
happening via uplift at the rate of about a meter per century. Portions of Hudson Bay have uplifted by
over 250 meters.
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