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 ...

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 ...

Starting out on a six-day series of wilderness hikes in the Grand Canyon on unmaintained trails where even a minor misstep can cost you your life is probably not the best time to discover you’re ...

Beneath the cliffs of western Colorado, a billion years of geologic history unfolds—and a century-old dream of accessibility still shapes the land.

How old is the Grand Canyon? Most scientists agree with the version that rangers at Grand Canyon National Park tell visitors -- that the 10-mile wide chasm in northern Arizona was carved by the ...

From an ancient Egyptian hoax to a mysterious disappearances and Cold War history, here are 10 bizarre facts you probably ...

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 ...

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 ...