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Friday, August 30, 2013

Huge canyon discovered under Greenland ice.

Huge canyon discovered under Greenland ice.

Canyon : is a deep ravine between cliffs often carved from the landscape by a river.

One of the biggest canyons in the world which is 800km long and up to 800m deep carved out by a great river more than four million years ago, before the ice arrived.

The canyon was found after scientists analysed radar signals collected by Nasa.







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