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Antarctic rift

A close-up view of the crack spreading across the ice shelf of Pine Island Glacier shows the details of the boulder-like blocks of ice that fell into the rift when it split, from this handout image captured by the Digital Mapping System (DMS) aboard NASA's DC-8 October 26, 2011. Scientists expect the crack, 18 miles (29 km) in length, to propagate and the ice shelf to calve an iceberg of more than 300 square miles (483 square km) in the coming months. Picture taken October 26, 2011. REUTERS/NASA/DMS/Handout

Antarctic ice rift growing

With its protective sea ice barrier melted away, Antarctica's Pine Island Glacier grows ever closer to finally dropping its New York City-sized iceberg into the ocean, according to NASA.