A volcano is an opening in a planet's surface which allows hot, molten rock, ash and gases to escape from below the surface. Volcanic activity involving the extrusion of rock tends to form mountains over a period of time.
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- Stromboli Volcano Data on Stromboli Volcano in Italian.
- Volcanoes and Volcanism Comprehensive site with news about latest activity in English, German, and Norwegian.
- Volcano World Brings modern and near real-time volcano information.
- Virtually Hawaii Hawaii satellite images, Virtual field trips and flights past the volcanoes.
- Volcano Live Provides information about volcanoes, eruption, and volcano treks, and links to other volcano educational sites. Includes links to volcano-cams.
- Michigan Technological University Volcanoes Provides information about volcanic hazard mitigation.
- U.S. Geological Survey, Volcano Hazards Program Monitors volcanoes and collects scientific information on volcanoes in the United States and elsewhere to reduce the risk from volcanic activity.
- Volcanoes of the United States Detailed information about US volcanoes by Steven R. Brantley of the U.S. Geological Survey.
- Physical Volcanology The volcanoes of southern Italy
- Decade Volcano -- Santorini Greece Information, photos, links and travel to Santorini, Stromboli, and other active volcanoes.
- Links to Volcano Information Excellent data on Latin American volcanoes, professors of volcanology, volcano observatories, and Canadian volcanoes.
- Russia's Volcanoes Guide to volcanoes of Kamchatka with images.
- Hawaiian and Other Volcanoes Eclectic site focused on Hawaiian volcanoes with links and cams to other volcanoes worldwide.
- Mount St. Helens Fact sheet of Mount St. Helens volcanic activity 1980 to 2000.
- Eruptions of Mount St. Helens Online version of a United States Geological Survey brochure on the history and geology of eruptions at Mount St. Helens.
- Activity Report (Weekly) Data on new activity and unrest, and ongoing activity at volcanoes throughout the world.
- The Lost World: Records in the Rocks Description of the complex geology of the Tweed Volcano in Australia, probably the largest, most easily accessible, erosion caldera in the world.
- Explorevolcanoes.com Guide to the world's best known and most accessible volcanoes. Each volcanic areas geology is accompanied by an eruptive history, walks and excursions. Includes an educational volcanic geology section.
- Colima's Active Volcano Photographs and information on this active volcano in Mexico.
- Five College Volcanology Lecture notes for a course on volcanoes at the University of Massachusetts.
- Volcanoes Provides the latest news on activity and some videos of eruptions.
- Katla Volcano News Provides news of this volcano in Iceland, views, warnings and resources.
- Mount St. Helens National Volcanic Monument General visitor information, photo gallery, monument attractions, volcano-cam, seismographic data and resource center links.
- Time: Etna Photographs as Europe's most active volcano comes back to life.