GRAND-ER CANYON DISCOVERED UNDER GREENLAND ICE SHEET

Hidden beneath the ice sheet that covers much ofGreenland is a vast canyon half a mile (800 m) deep and 470 miles (750 km) in length. By comparison, the Grand Canyon, though deeper, is just 217 miles (349 km) long. The hidden gorge, which has never been seen by human eyes, was discovered by chance as scientists researching climate change mapped Greenland’s bedrock. Now covered by an ice sheet that is 2 miles (3 km) thick at points and is so heavy it causes the entire island of Greenland to sag in the middle, the canyon was likely carved millions of years ago by an ancient river. More… Discuss