This web page, created by the US Energy Information Administration, gives a description of geysers, where they are found, the conditions that create them, and the process of their eruptions. The geysers of Yellowstone National Park are described as the best collection of geysers in the world. The author notes that geothermal energy can be derived from geyser fields, but geothermal electricity production depletes the geysers' water and removes some of the available heat, reducing and sometimes destroying geyser activity.
