Video: Mega-canyon discovered beneath Greenland's ice sheet
Thursday, August 29, 2013 - 16:30
in Earth & Climate
Scientists using ice-penetrating radar discovered a canyon below the ice sheet in northern Greenland. The canyon has the characteristics of a meandering river channel. It is more than 450 miles long and in places is almost a half-mile deep and is on the same scale as parts of the Grand Canyon.