1. Hot spring
   hot spring is a place where warm or hot groundwater issues from the ground on a regular basis for at least a predictable part of the year..
   http: //academickids.com/encyclopedia/index.php...
   
   
2. Yellowstone National Park
   Yellowstone National Park is a U.S. National Park located in the states of Idaho, Montana, and Wyoming. Yellowstone is the first and oldest national park in the world..
   http: //academickids.com/encyclopedia/index.php...
   
   
3. Geyser
   A geyser is a type of hot spring that erupts periodically, ejecting a column of hot water and steam into the air..
   http: //academickids.com/encyclopedia/index.php...
   
   
4. Weird Geology: Geysers
   Geysers are some of the most unusual geologic phenomena in the world. They are incredible natural fountains that can shoot boiling hot water and steam hundreds of feet into the sky in violent eruptions
   http: //unmuseum.org/geysers.htm
   
   
5. Geyser animation
   Observe an animation showing how geysers erupt
   http: //classzone.com/books/earth_science/terc/...
   
   
6. About Geysers
   A geyser is a hot spring that periodically erupts, throwing water into the air. Though that sounds simple, geysers are extremely rare
   http: //uweb.ucsb.edu/~glennon/geysers/
   
   
7. Geysers and the Earth’s Plumbing Systems
   An article and images on how geysers work.
   http: //umich.edu/~gs265/geysers.html
   
   
8. Geysers
   geyser is a special type of hot spring that erupts periodically. For both geysers and hot springs, groundwater circulating at depth becomes heated by the hot rock below and moves by convection
   http: //hanksville.org/daniel/geology/geysers.h...
   
   
9. Geyser Fields
   Map and information about geysers found around the world.
   http: //www2.wku.edu/www/geoweb/geyser/location.htm...