There's a deadly 40,000 km (29,400 mi)-long zone that passes through 15 countries. This area is dotted with volcanoes, giving ...

Mount Marapi in West Sumatra erupted again today, with an ash plume reaching 250 meters. Its activity level is Alert II.

Yellowstone's volcanic past reveals a dynamic system of repeated caldera-forming eruptions and smaller lava flows, with magma ...