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 ... more 
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. REUTERS/NASA Earth Observatory/Holli Riebeek/Handout via Reuters. (ANTARCTICA - Tags: SCIENCE TECHNOLOGY ENVIRONMENT) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS less 
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Reuters | Photo By NASA / Reuters
Wed, Apr 23, 2014 12:12 PM EDT