Valles Marineris in imagery captured the Mars Reconnaissance Orbiter. Global topography: NASA/GSFC CTX global mosaic: ...

The Grand Canyon is a breathtaking geologic wonder located in the northern part of the state of Arizona, USA, with its rock layers dating back a million years laid bare before the eye. Scientists ...

Sitting near the head of the Grand Canyon, the Kaibab uplift is a 650-foot (250-meter) barrier that any prehistoric lake or river must have carved through before dropping down into the future gorge.

The canyon isn’t 6 million years old, some scientists say, but more like 70 million years old. If this order-of-magnitude challenge to the othodoxy holds up, it would mean the Grand Canyon has ...

"An ancient Grand Canyon has important implications for understanding the evolution of landscapes, topography, hydrology and tectonics in the western U.S. and in mountain belts more generally ...

Grand Canyon National Park draws 4.7 million visitors a year to the northwest corner of Arizona to hike, camp, or watch wildlife. But most of them don’t realize that the lands within and ...

In Grand Canyon National Park, these vital signs include water quality, bird communities, springs, aquatic macroinvertebrates and upland vegetation and soils. Management of the Outstanding Universal ...

A 50-year-old hiker was found unresponsive on the Bright Angel Trail. A man hiking in the Grand Canyon has died after being found unresponsive over the weekend, marking the third death in the national ...

An unexpected and previously unknown topography beneath Antarctica's floating ice shelves has come to light, courtesy of a new study. When a team of international scientists examined the underside ...

A 63-year-old hiker was rescued from the Grand Canyon in Arizona last week after he suffered a traumatic shoulder injury due to a fall, a volunteer search and rescue organization affiliated with a ...

Could the origins of the Grand Canyon lie in an enormous flood? The answer is no, says geologist Bill Dickinson, an emeritus professor of geology at the University of Arizona in Tucson.