GRAND CANYON, Ariz. — When I first peered into the layer cake that is the Grand Canyon several years ago, I was surprised to spot a continuous strip of green between a grayish section and a red-brown ...

Dams are not just a 20th Century phenomenon in Grand Canyon. As early as 1882, geologists realized that the Colorado River was blocked several times in the past by huge lava dams. They theorized that ...

Introducing the Grand Canyon / Stanley S. Beus, Michael Morales -- Precambrian crystalline core / R. S. Babcock -- Grand Canyon Supergroup : Unkar group / J. D. Hendricks, G. M. Stevenson -- Grand ...

The Grand Canyon in northern Arizona is a favorite for astronauts shooting photos from the International Space Station, as well as one of the best-known tourist attractions in the world. The steep ...

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 ...

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 ...

Astronaut photograph of the Grand Canyon was acquired on March 25, 2014, with a Nikon D3S digital camera using a 180 millimeter lens, and is provided by the ISS Crew Earth Observations Facility and ...

Grand Canyon backcountry permits: https://www.nps.gov/grca/planyourvisit/backcountry-permit.htm U.S. Geologic Survey explanation of Grand Canyon geology: http ...