Huge canyon discovered under Greenland ice

One of the biggest canyons in the world has been found beneath the ice sheet that smothers most of Greenland.

The canyon - which is 800km long and up to 800m deep - was carved out by a great river more than four million years ago, before the ice arrived.

It was discovered by accident as scientists researching climate change mapped Greenland’s bedrock by radar.

See full Article: http://www.bbc.co.uk/news/science-environment-23866810