Massive ‘Grand Canyon’ Found Hidden Beneath Greenland’s Ice

Read more: http://www.universetoday.com/104427/massive-grand-canyon-found-hidden-beneath-greenlands-ice/#ixzz2dP7e42nC

Data gathered by NASA’s Operation IceBridge, an aerial science observation mission, has uncovered a previously unknown massive canyon in Greenland, hidden under a kilometer of ice.

The canyon, found by airborne radar data, has the same characteristics of a winding river channel like the Grand Canyon in Arizona. It is at least 750 kilometers (460 miles) long, making it longer than the Grand Canyon. In some places, it is as deep as 800 meters (2,600 feet), on scale parts of the Grand Canyon. This immense feature is thought to predate the ice sheet that has covered Greenland for the last few million years.

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