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 function beneath their rocky surfaces? What drives the rumbling vibrations, called tremor, that occur when molten rock or gases ...