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…showed last 75 words of 682 total…age may have been triggered by freshwater occupying a location where saltwater was supposed to have been. There is a deep ocean current of very salty water beneath the gulf stream travelling from the tropics to the North Atlantic. As it reaches the North, it disturbs surface water, the salty water rises and discharges heat, and then it cycles back to the tropics. What could have triggered an ice age, a surge of freshwater (Stuller 33).