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A huge ice shelf 500 miles from the North Pole broke up, leaving a large floating island of ice in the Canadian Arctic, scientists said.
The 25.5 square-mile Ayles ice shelf broke free from the northern coast of Ellesmere Island in August 2005, National Geographic said. Scientists waited until now to announce the event because they wanted to reconstruct what happened.
When it occurred, the break registered as a small earthquake on instruments stationed 150 miles away, observers said.