What evidence did the most recent ice age provide us to evaluate the merits of the Pratt-Airy isostasy and flexural isostasy models?
What will be an ideal response?
Both models require that the crust subside due to the weight of the glacial ice. The Pratt-Airy model requires that only the crust beneath the glaciers subsides and the crust adjusts rather quickly as the ice melts and would be completely adjusted after all the ice is gone. The flexural model requires that an area larger than the area covered with glacial ice will subside and that the adjustment to the melting of the ice will be slow. Data supports the flexural isostasy model because areas larger than those covered by ice are still undergoing isostatic adjustment today.
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