Volcanoes shape landscapes and influence climates, but not all of them erupt. Some have been dormant for hundreds of years but still pose threats. Even volcanoes that appear to be dormant threaten ...

On June 14, 1914, three men climbed Lassen Peak to see why a seemingly dormant volcano had started rumbling 16 days before. Now, peering into a newborn crater, they felt the ground tremble.

Mount Chimborazo of Ecuador may be a dormant volcano, but its neighbors are anything but. In fact, the nearby Reventador volcano has erupted more than 25 times in the past 500 years. A Rare Look ...