This 2010 photo provided by researcher Ian Joughin shows crevasses near the edge of Pine Island Glacier.
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After mysteriously expanding for decades, Antarctica's sea ice cover melted by an area four times greater than France in just a few years and now stands at a record low, according to a study published Monday. Scientists already knew Antarctica was thawing at an increasing rate, like the Arctic, because of accelerating discharge from glaciers, the rivers of ice that push up slowly against the shore.But between 1979 and 2014, they observed a phenomenon that was both intriguing and reassuring: the sea ice cover was expanding.From a peak area of 12.8 million square kilometers, the sea ice cover receded 2 million square kilometers for reasons that remain unknown.
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