Iceberg the Size of New York City Splitting off from Antarctic Ice Sheet

Iceberg the Size of New York City Splitting off from Antarctic Ice Sheet: "Here's your first look at a ginormous crack in Western Antarctica's Pine Island Glacier, which is a staggering 18 miles long, 240 feet wide and up to 190 feet deep. The crack appears to be widening, and will send off a 300 square mile iceberg in the next few months, according to NASA. Once that happens, the ice shelf that forms the sea-facing side of the glacier will have retreated to its furthest point since researchers started measuring in the 1940s."