Scientists discovered a magma cap almost 2.5 miles below the surface at Yellowstone National Park. Here’s what that means for the risk of another supervolcano eruption.

Joy Macfarlane, left, and her husband Jared Macfarlane pause for a photo while exploring what has become known as 'Teepee ...

Are we ready for a mega-blast from the supervolcano in Yellowstone National Park?

A massive eruption 74,000 years ago shook the planet, and archaeologists are using volcanic glass to figure out how humans ...

A massive eruption 74,000 years ago shook the planet, and archaeologists are using volcanic glass to figure out how humans ...

Lithium is shaping geopolitics as surely as oil once did. A new U.S. breakthrough for extracting it from brines could ease ...