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 ...

Grand Canyon fossils in the Bright Angel formation reveal 500M-year-old animals with dual feeding structures, reshaping ...

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 ...

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 ...

This one-day itinerary includes the best of Grand Canyon's South Rim, including El Tovar, Mather Point, Bright Angel Trail and Desert View Watchtower.

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 ...