The Grand Canyon in Arizona is one of Earth's natural wonders, carved out over millions of years by the gradual erosion power ...

WASHINGTON - The Grand Canyon in Arizona is one of Earth's natural wonders, carved out over millions of years by the gradual ...

The Grand Canyon in Arizona is one of Earth's natural wonders, carved out over millions of years by the gradual erosion power ...

They were dug out by debris sent violently aloft when an asteroid or comet struck the lunar surface 3.8 billion years ago.

Navajo communities along the 174-mile stretch of the uranium haul route on Diné lands say the tribe and mining company are ...

Learn about the astounding megaflood that reshaped the Mediterranean. Discover the evidence of this ancient catastrophe and ...

There are alot of great caves in the US but there is a hot debate over which one is better Mammoth Cave or Carlsbad Caverns.

Of all the challenges facing the Colorado River, there’s at least one that all stakeholders are working on collaboratively, ...

This Gilbert travel guide offers hotels, rental cars, and top attractions to see when you visit Gilbert, Arizona.

There are no admission fees, though all park visitors must purchase a seven-day pass ($35 per vehicle) before ... erosion caused by hydrothermal activity, water and other natural forces, the Grand ...

Visitors to Utah can hike up to an incredible stone arch at Arches National Park, wander through a "forest" of hoodoos at Bryce Canyon, or explore colorful badlands at Grand Staircase-Escalante ...