There are 1,500 active volcanoes around the world, many of them found deep in the ocean. Yet, there are only 20 supervolcanoes on Earth. If Mount Everest were one of them, sitting on a giant pool of ...

HONOLULU (AP) — Hawaii’s Mauna Loa, the world’s largest active volcano, has started to erupt, prompting volcanic ash and debris to fall nearby, authorities said Monday. The eruption began late Sunday ...

Are there still active volcanoes on Mars? New detections of hydrogen chloride from below the surface suggest flowing magma.

Add Yahoo as a preferred source to see more of our stories on Google. Yellowstone’s massive supervolcano and Mount St. Helens, the volcano that devastated Washington in 1980, are among America’s most ...

Mars might have a geological secret hiding underneath all that red dust. Scientists studying the planet have discovered ...