A wildfire along the Grand Canyon’s North Rim grew rapidly over the weekend and destroyed a historic lodge and visitors ...

Arizona groundwater is a lifeline that sustains cities, tribal communities, farms, and plants and animals. Learn the basics.

A meteorite that struck near Winslow, Arizona, about 56,000 years ago may have triggered a massive landslide in the Grand ...

The Grand Canyon is vast, covering 1,218,375 acres and 1,904 square miles across Arizona. Here's what to know.

Cutting‑edge dating reveals driftwood high in Grand Canyon caves 55,250 years ago when a meteor’s shock wave blocked and ...

In this secluded paradise, mail still arrives by mule, turquoise cascades tumble into travertine pools, and time flows at the ...

Geology is full of detective stories about the Earth's history, and a new paper in Geology by University of New Mexico ...

The Dragon Bravo Fire in Arizona has destroyed dozens of structures and a water treatment facility on the Grand Canyon's North Rim.