When you think of the United States, images of sprawling cities and vast landscapes might come to mind, but not the hidden and ever-present geological threat: volcanoes. While you might associate ...

Costa Rica's Arenal Volcano National Park is a gorgeous nature destination.

Scientists are warning that volcanoes buried under ice sheets are not as dormant as they look. As glaciers thin and retreat, the pressure that has kept magma in check is easing, and a growing body of ...

POPOCATÉPETL VOLCANO, Mexico — In the predawn darkness, a team of scientists climbs the slope of Mexico's Popocatépetl volcano, one of the world's most active and whose eruption could affect millions ...