A large crater lies underneath Greenland’s Hiawatha Glacier—a well-known, but little-studied part of the planet. Now scientists…

A large crater lies underneath Greenland’s Hiawatha Glacier—a well-known, but little-studied part of the planet. Now scientists hope to determine if it could be linked to a controversial extinction theory.https://t.co/sjp6uSq9Au

— National Geographic Magazine (@NatGeoMag) November 15, 2018

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