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NASA data reveals mega-canyon under Greenland ice sheet

29 August 2013

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Data from a NASA airborne science mission reveals evidence of a large and previously unknown canyon hidden under a mile of Greenland ice.

The canyon has the characteristics of a winding river channel and is at least 460 miles (750 kilometres) long, making it longer than the Grand Canyon. In some places, it is as deep as 2,600 feet (800 metres), on scale with segments of the Grand Canyon. This immense feature is thought to predate the ice sheet that has covered Greenland for the last few million years.

"One might assume that the landscape of the Earth has been fully explored and mapped," said Jonathan Bamber, professor of physical geography at the University of Bristol in the United Kingdom, and lead author of the study. "Our research shows there's still a lot left to discover."

Source: National Aeronautics and Space Administration (NASA)