Two Grand Canyon-size features on the far side of the moon were likely formed in about 10 minutes after an unknown object ...

Groundwater is life in Arizona. Find out how we’re helping Grand Canyon communities manage their limited water supplies.

The vast valleys of Vallis Schrödinger and Vallis Planck demonstrate the incredible forces that shaped the face of the Moon.

Plan a winter trip to the Grand Canyon with our winter guide to the Grand Canyon. Don't let a little snow keep you from ...

The Grand Canyon, located in Arizona, USA, is one of the most iconic natural wonders in the world. Carved over millions of years by the Colorado River, this awe-inspiring canyon stretches 277 miles.

Located in Arizona, the Grand Canyon is currently 446 kilometers (277 miles) long, spreads up to 29 kilometers (18 miles) wide, and has a depth of up to 1.8 kilometers (1.1 miles).

Two gigantic canyons on the moon — both deeper than the Grand Canyon — were carved in less than 10 minutes by floods of rocks ...

Is that the right word for the Colorado Plateau, this thirsty sprawl of gaudy-hued stone festooned with such names as Hell Roaring Canyon ... dozens of layers of rock: limestones, mudstones ...

LIZ BONNIN: So those layers of rock are really a bit like the rings on a section of a tree trunk. Both giving a visible indication of how old they are. Liz Bonnin introduces the Grand Canyon with ...