This undated photo provided by the U.S. Geological Survey Astrogeology Science Center shows Apollo 15 astronauts Jim Irwin, left, and Dave Scott driving a prototype of a lunar rover in a volcanic ...

PETRIFIED FOREST – Adam Marsh and Michelle Stocker had been out all day in the hot weather, breaking rocks and sifting through the pieces, when they made a major discovery last May. “What we saw under ...

The state of Arizona and its picturesque landscapes have been shaped by a geological history of volcano eruptions across the region. Some of the oldest volcanic rocks in the state are 1.8 billion ...

A view of the Stikine River near Wrangell and Petersburg. (Courtesy Cindi Lagoudakis) A geologist who has studied Southeast Alaska’s rocks and minerals for decades is creating a new geologic map of ...

FLAGSTAFF, Ariz. – Before Neil Armstrong and Buzz Aldrin knew they would be the first to walk on the moon, they took crash courses in geology at the Grand Canyon and a nearby impact crater that is the ...

In yet another historical photo, Pete Conrad and Alan Bean stand in the volcanic cinder field bordered by ponderosa pine trees holding a tool carrier. Bean would later say: “I now love geology, thanks ...

FLAGSTAFF, Ariz. — Before Neil Armstrong and Buzz Aldrin knew they would be the first to walk on the moon, they took crash courses in geology at the Grand Canyon and a nearby impact crater that is the ...