A tongue of lava from the eruption flowed into the parking lot of the geothermal spa.

The Cretaceous sandstone of Libya’s Messak Settafet plateau shows signs of a modern oil field and Stone Age quarries and hunting sites.

A novel radar image reveals structural elements of Camp Century, an abandoned U.S. military base buried within the Greenland Ice Sheet.

Orange, yellow, and white lights span Chicago at night, illuminating its gridded downtown and tracing its sinuous rivers and parks.

The amount of freshwater stored on land and underground has plummeted in the past decade, which might indicate that Earth’s continents have entered a persistently drier phase.

Research suggests that airborne particles called aerosols contribute to longer-lasting outbreaks of fog.

Damaging winds from the strong storm knocked out power for thousands of people in Washington state.