Volcanoes & Geysers
A geyser is a hot spring that periodically erupts throwing water into the air. Seems simple and common enough, but in fact, geysers are extremely rare. In all of the world, there are less than one thousand geysers.
http://hoffman.wku.edu/geysers/ A b o u t - G e y s e r s
Geysers and the Earth's Plumbing Systems
Geysers, Fumaroles, and Hot Springs
Geysers, fumaroles (also called solfataras), and hot springs are generally found in regions of young volcanic activity. Surface water percolates downward through the rocks below the Earth's surface to high-temperature regions surrounding a magma reservoir, either active or recently solidified but still hot. There the water is heated, becomes less dense, and rises back to the surface along fissures and cracks. Sometimes these features are called "dying volcanoes" because they seem to represent the last stage of volcanic activity as the magma, at depth, cools and hardens.
Weird Geology: Geysers
Volcanoes
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Pink and White Terraces
Welcome to the Michigan Technological University Volcanoes Page
Volcanoes Around the World
U.S. Geological SurveyVolcano Hazards Program
How Volcanoes Work
THE ELECTRONIC VOLCANO
Global Volcanism Program
Volcanism is the process whereby materials formed inside the Earth come out onto the surface. These materials include lava (molten rock flowing on Earth's surface); dust, ash, and bombs (collectively called pyroclastics) which shoot up into the air during an eruption, sooner or later to fall to the surface; and gases which are released into the atmosphere. How explosive (exciting!) a volcanic eruption is depends in large measure on what kinds of materials are released during the eruption.
