You’d Never Guess What’s Under Here
Two men surveying the Antarctica’s Ferrigno Glacier, which is rapidly melting, have detected something so awesome they could scarcely believe it at first. But it’s there, under the surface: a vast canyon that rivals the Grand Canyon. [readon]
The steep walls that frame the canyon are nearly a mile tall – just like the Grand Canyon. It’s about six miles across (the Grand Canyon is wider in some places, narrower in others) and at least 62 miles long, possibly far longer if it extends into the sea. The main difference is that while the Grand Canyon was formed mainly by erosion, the one in Antarctica was created by the tectonic forces of continental rifting.
The full story is on Our Amazing Planet.