How do you make a Grand Canyon? I was in Arizona recently for Phoenix Comic-Con, and had the amazing pleasure of seeing one of Earth's greatest natural wonders the Grand Canyon. More than a mile deep, and several miles across, it just defies belief. But I couldn't help but think, the Colorado River down at the bottom isn't that big. How did it cut a canyon so massive? How old is the Grand Canyon?

Originally released by Knowledgemotion, 2016. Streaming video file encoded with permission for digital streaming by Infobase on February 21, 2020.

How Does A Canyon Become Grand? (4:03); .