(Photo: V.L. Sharpton)300,000 years ago, a meteorite hit western Australia, boring a hole 400 feet deep and 2,880 feet across into the surface of the earth. This crater, now known as Wolfe Creek Crater, gradually filled...

In Kenya lies Lake Turkana, the world's largest alkaline lake. This is the Nabuyatom Crater, a geological marvel of that lake. It's a caldera--the remnants of a collapsed volcano.Link -via TYWKIWDBI | Photo: Christian St...