What Triggered Antarctic Glaciation - Insert Your Hypothesis Here

New geologic evidence that casts doubt on one of the conventional explanations for how Antarctica's ice sheet began forming, says a team of researchers writing in Geology. The Antarctic Circumpolar Current (ACC), an ocean current flowing clockwise around the entire continent, insulates Antarctica from warmer ocean water to the north, helping maintain the ice sheet. For several decades, scientists have surmised that the onset of a complete ACC played a critical role in the initial glaciation of the continent about 34 million years ago. read more

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