Massive fracture in Antarctic ice shelf is 70 miles long, a football field wide, and a third of a mile deep

A massive rift in the Antarctic Peninsula’s Larsen C ice shelf has been growing steadily, threatening to cut all the way across. If it does, an iceberg roughly the size of the state of Delaware — and perhaps even bigger — will float off.

New observations by scientists on NASA’s IceBridge mission, an airborne survey of polar ice, reveal that the rift is now about 70 miles long. And it cuts down about 1,700 feet, all the way through the floating shelf of ice.

Should Larsen C throw off a

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