The B-31 Iceberg is seen before, (top) on October 28, 2013 and after separating on November 13, 2013, from a rift in Antarctica's Pine Island Glacier in this NASA Earth Observatory handout image. Scientists are monitoring an unusually large iceberg – roughly six times the size of Manhattan – that broke off from an Antarctic glacier and is heading into the open ocean, although not in an area heavily navigated by ships. (Photo by Holli Riebeek/Reuters/NASA Earth Observatory)
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