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Vredefort Dome

At 186 miles wide, Vredefort Dome in South Africa is the site of the biggest impact crater on Earth. And at an estimated two billion years old, it makes the Chicxulub Crater look like a spring chicken. Today, the original crater, which was caused by a meteorite about six miles wide, is mostly eroded away, but what remains is a dome created when the walls of the crater slumped, pushing up granite rocks from the center of the meteorite strike.

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