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vo nasa greenland mega canyon_00000718.jpg
vo nasa greenland mega canyon_00000718.jpg

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    Huge canyon discovered under frozen land

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Huge canyon discovered under frozen land

Radar imagery from NASA reveals a 460-mile canyon underneath the ice sheet that covers Greenland.

Huge canyon discovered under frozen land

Radar imagery from NASA reveals a 460-mile canyon underneath the ice sheet that covers Greenland.