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The closing of the Isthmus of Panama alone did not trigger the beginning of the Ice Age, but it is a potentially decisive step on the way of ice shield build up in the north. The development that leads to the current Ice Age, per definition a phase in earth's history were polar and continental ice shield build up, starts much earlier. Cooling began after a ...


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Pretty much, because the joining of the Americas caused a shift in the circulation of the oceans. Because before, there was no antarctic circumpolar current (ACC), but there was a current (maybe more) going north to south, distributing heat to the Antarctic. The closing of the isthmus caused that current to disappear, and create the ACC and the Weddel ...


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