Massive canyon under Greenland ice


WASHINGTON, D.C.: A huge canyon twice the size of the longest river in Britain and as deep as the Grand Canyon lies beneath the ice sheet in Greenland, scientists said on Thursday (Friday in Manila).

Prior to the establishment of the ice sheet some four million years ago, the canyon is believed to have been a major pathway for water from the interior of the landmass to the coast.




Scientists found the canyon using airborne radar data, much of which came from a National Aeronautics Space Administration (NASA) mission called Operation IceBridge, which used radio waves that traveled through the ice to measure the depth of the bedrock.




The study was published in the US journal Science.



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