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Massive canyon lies beneath Greenland ice sheet
By AFP | AFP – Thu, Aug 29, 2013
This NASA Earth Observatory image, captured during an IceBridge flight and released May 3, 2012, shows a glacier in eastern Greenland. 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 Thursday
http://uk.news.yahoo.com/video/giant-canyon-discovered-under-greenland-094100902.html
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 Thursday.
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 land mass to the coast.
Even today, the deep river channel -- which originates in the center of Greenland and terminates at its northern coast -- transports sub-glacial meltwater to the edge of the ice sheet and then into the ocean.
"A 750-kilometer (460-mile) canyon preserved under the ice for millions of years is a breathtaking find in itself, but this research is also important in furthering our understanding of Greenland's past," said David Vaughan of the British Antarctic Survey.
"This area's ice sheet contributes to sea level rise and this work can help us put current changes in context."
Scientists found the canyon using airborne radar data, much of which came from a NASA mission called Operation IceBridge, which used radio waves that traveled through the ice to measure the depth of the bedrock.
The Greenland sub-ice canyon is about twice as long as the River Severn in Britain, which extends 350 kilometers.
Michael Studinger, Operation IceBridge Project Scientist at NASA Goddard Space Flight Center, described the finding as "quite remarkable."
"It shows how little we still know about the bedrock below large continental ice sheets."
The study was published in the US journal Science.
http://uk.news.yahoo.com/massive-canyon-lies-beneath-greenland-ice-sheet-200615828.html?vp=1#XgAP7aX
A mega-canyon on the same scale as the American landmark lies buried under ice in Greenland, according to scientists
Vast canyon discovered under Greenland ice
http://uk.news.yahoo.com/video/vast-canyon-discovered-under-greenland-060218272.html
A vast and previously unmapped gorge, 800 metres deep, has been found under ice in Greenland. The canyon is 750 kilometres long and is said to be comparable in scale to parts of the Grand Canyon that is twice as deep – 1.6 kilometres – at its deepest. The Greenland canyon is buried under deep ice. Scientists used airborne data collected mainly by NASA and by scientists in Britain and Germany to piece together maps of the canyon.
