Friday, August 30, 2013
466 mile-long canyon discovered under a Greenland ice sheet - and scientists believe it's just the tip of the iceberg
466 mile-long canyon discovered under a Greenland ice sheet - and scientists believe it's just the tip of the iceberg | Mail Online: "A 466 mile-long chasm on the same scale as parts of the Grand Canyon has been discovered beneath the Greenland ice sheet."
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