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Smooth_Imagination t1_ivhuynh wrote

I'm sure that could be part of it, but the ice melt during certain phases was so incredibly rapid that a theory was proposed that it was accelerated due to the top of the ice falling in altitude. As the altitude at the top of the ice sheet declines it encounters denser air which is warmer, this effectively created a rapid feedback that collapsed the Laurentide ice saddle across North America.