The Canyon is a Book of Revelations in the rock-leaved Bible of geology. - John Wesley Powell A professor of geology at Illinois Wesleyan, John Wesley Powell had more than just a passing interest in ...

I love the Grand Canyon, both personally (because of all the good memories I have of my adventures there), and as a scientist. I first saw it in the early summer of 1981 when I went on a six-week-long ...

Molten lava, crashing waves, seeping rainwater, and oil-eating bacteria: These are some of the forces of nature that, over many years, create caves from rock like limestone and sandstone. In this ...

Marble is best known for what it can be made into — incredible artworks or tacky ashtrays. But before it was that prized white-grey rock, marble was something a lot more pedestrian — limestone. For ...