Vast 466-mile-long canyon discovered under Greenland ice sheet





The hidden mega-canyon is at least 466 miles (740km) long and up to 2,624ft (800m) deep in places. The feature, resembling a meandering river channel, is believed to pre-date the ice sheet that has covered Greenland for millions of years.



via Pocket http://www.independent.co.uk/news/world/europe/vast-466milelong-canyon-discovered-under-greenland-ice-sheet-8790842.html

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