Even if you didn't sleep through your elementary school geography lessons, you probably have an inkling that Greenland is 75 percent covered in ice. But what you didn't know was that tucked underneath all that ice sits the longest canyon in the world.
NASA discovered the 460-mile-long canyon while sending special radar signals through Greenland's ice, probably in hopes of finding something green so we could justify that stupid name. The longer it took the signals to bounce back, the deeper the canyon -- and scientists aren't even done measuring it yet.
The best part of the whole story is that the longest canyon in the world has been playing hide-and-seek with us since before humanity existed. You win this round, awe-inspiring geological formation, but you'll get yours when we finally go extinct.
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