Transcripts of Greenland_mega_canyon_4097



[music] Buried under a mile of ice, it's never been seen by human eyes. But using ice-penetrating radar, scientists have discovered a giant canyon carved into Greenland’s bedrock. More than 400 miles long and up to a half mile deep, shown here as the dark brown groove in the center of the island, the canyon is thought to pre-date Greenland's massive ice sheet. The hidden feature was discovered by a team led by the University of Bristol, using radar data from a number of airborne campaigns from the United Kingdom and Germany, and a NASA mission called Operation IceBridge, which surveys this region with a range of different instruments every year to monitor changes in the Greenland Ice Sheet. From the interior of Greenland, the canyon snakes around up to the fjord of the Petermann Glacier on the northern coast, and researchers suspect it may play a major role in transporting melt water below the ice into the Arctic Ocean. 

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