The B-31 Iceberg is seen after separating from a rift in Antarctica's Pine Island Glacier in this NASA Earth Observatory handout image acquired on November 13, 2013. 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)
