The Grand Canyon is the biggest canyon on earth: 277 miles long, 10 miles wide, and a mile deep. It contains some of the oldest exposed rock on earth, Precambrian Vishnu schist, formed 1.7 billion ...

Forged by the wear of water rushing over rocks, Olo Canyon is concealed inside the Grand Canyon. Its alluring landscape includes natural springs and rocks shaped like cathedral amphitheaters.

Two gorges on the Moon that are deeper than the Grand Canyon were carved out in less than 10 minutes by space rocks travelling at the speed of a bullet, astronomers have revealed. The Moon canyons ...