Big canyon entombed beneath Greenland’s ice

Newly discovered chasm helps explain island's lack of subglacial lakes

A 750-kilometer-long canyon (3-D  view shown) lies hidden beneath Greenland's ice sheet, a new study reveals.  Researchers say a river carved the channel several million years ago, before  the island was covered in ice.

 J. Bamber/Univ. of Bristol

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