Observe an animation showing how geysers erupt
http://www.classzone.com/books/earth_science/terc/content/visualizations/es1403/es1403page01.cfm?chapter_no=visualization

Dave McFarland, Jamie Larsen, Exploring Earth


This Flash animation uses a cross section to explain geyser eruption. As groundwater enters fractured bedrock, it is heated by nearby magma but is prevented from boiling by the pressure of overlying water. Eventually, the water becomes superheated and is forced upward, pushing water to the surface. The animation can be paused and rewound to emphasize important points.

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This resource is referenced here:Keywords: geysers, groundwater