The Grand Canyon, located in Arizona, USA, is one of the most iconic natural wonders in the world. Carved over millions of ...

John Wesley Powell A professor of geology at Illinois Wesleyan, John Wesley Powell had more than just a passing interest in the layers upon layers of rocks exposed by the Colorado River.

Grand River [Colorado River] came upon us or rather we ... and has cut its way under the rock, excavating a vast half-circular chamber, which, if utilized for a theater, would give sitting to ...