An ice shelf the size of has collapsed in East Antarctica, an area long thought to be stable and not hit much by , concerned scientists said Friday.Satellite images show the 460 square-mile Conger Ice Shelf disintegrated into the ocean completely on or around March 15. The collapse marked the first time in human history that the frigid region had an ice shelf collapse.Ice shelves, permanent floating sheets of ice attached to land, take thousands of years to form and act like levees holding back snow and ice that would otherwise flow into the ocean, causing seas to rise.
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