This combination of Dec. 10, 2013, left, and March 11, 2014 photos provided by NASA shows a large iceberg separating from the Pine Island Glacier and traveling across Pine Island Bay in Antarctica. ... more 
This combination of Dec. 10, 2013, left, and March 11, 2014 photos provided by NASA shows a large iceberg separating from the Pine Island Glacier and traveling across Pine Island Bay in Antarctica. Scientists are watching the iceberg, which is bigger than the island of Guam, as it slowly moves away from the glacier, bottom right in December, upper left center in March. NASA scientist Kelly Brunt said it is more a wonder than a worry and is not a threat to shipping or sea level rise. (AP Photo/NASA) less 
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Associated Press | Photo By NASA
Wed, Apr 23, 2014 2:33 PM EDT