What’s causing all this volcanic activity? It's called the Ring of Fire. The Ring of Fire and volcanic eruptions. The Ring of Fire is a horseshoe-shaped region in the Pacific about 25,000 miles ...

A volcanic crater northeast of Healy, Alaska, that is part of the Buzzard Creek maars. (Photo by Chris Nye) For years, scientists have wondered why North America’s highest mountain is not a volcano.

Planetary scientists Paul Byrne and Rebecca Hahn at Washington University in St. Louis have created the first comprehensive map of volcanoes on Venus, pinpointing 85,000 of them. Their study was ...