Environment News Service: Using ice-penetrating radar, scientists have discovered a long, deep canyon that exists a mile beneath the Greenland ice sheet, data from a NASA airborne science mission and an international research team reveals.
The scientific team identified a continuous bedrock canyon that extends from almost the center of the island and ends at its northern extremity in a deep fjord connecting to the Arctic ocean.
The canyon looks like a winding river channel at least 460 miles (750 kilometers) long, making...