A red-hot lava flow two miles long has been attracting crowds to the slopes of Mount Etna on the island of Sicily, Italy.

Today, we know of Mars as a cold, dry desert, with patches of subterranean ice and ice caps at its poles. Billions of years ...

The McDermitt Caldera, an ancient supervolcano straddling the Nevada-Oregon border, may hold the world’s largest lithium deposit ever discovered. With estimates ranging between 20 and 40 million ...