Mount St. Helens -- What is a volcano? -- Layers of earth -- Kinds of volcanoes -- Eruptions -- Other dangers -- How volcanoes help -- From lava to land -- Dormant volcanoes -- Geothermal energy -- ...

Volcanoes are a powerful force of nature. There are about 1500 active volcanoes on our planet right now. A volcano is an opening in the Earth's crust that allows lava and other volcanic matter to ...

A volcano that has been dormant for hundreds of thousands of years could be gearing up for a massive explosion, according to ...

How do volcanoes work? What happens beneath their surface? What causes the vibrations—known as tremor—that occur when magma ...

Discover why volcanoes erupt, how magma and gas pressure trigger eruptions and the role of tectonic plates in explosive volcanic activity.

Io, one of Jupiter’s Galilean satellites, is the most volcanically active body in the solar system. Images from spacecraft have shown molten lava erupting along walls that dam giant lava lakes and ...

NASA scientists say the images provide far more than just a striking never-before-seen view of the Martian geography. Studying the features detailed in Odyssey's photos could help NASA prepare for ...