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Mega canyon found under Greenland's ice shelf

NASA's Operation IceBridge found a 460-mile long canyon below Greenland's ice shelf, using radar data.

http://www.wlbz2.com/video/2639172379001/1/Mega-canyon-found-under-Greenlands-ice-shelf http://bc_gvpc.edgesuite.net/img/963482463001/201308/1829/963482463001_2639151528001_thumbnail-for-video-2639118391001.jpg?pubId=963482463001 Mega canyon found under Greenland's ice shelf NASA's Operation IceBridge found a 460-mile long canyon below Greenland's ice shelf, using radar data. ice shelfenvironmentnatureNASAgreengreenland canyonvpcNational Newsscience 01:07

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