Yellowstone area is formed from 2 million years ago after volcanic eruption activity. The first eruption occurred more than 2 million years ago created the Huckleberry Valley Ridge. Service 1 million years ago Monday, that make up the Valley Island Park and the last 600,000 years ago, services make up the Lava Creek Tuff. Due to the impact of the phenomenon of volcanic eruptions and the special geological structure should Yellowstone has hundreds of hot water injection wells, called geyser, among which the most famous is the injection wells, Old Faithful, the place for true 70 minutes of hot water will shoot up to 45 m high. This phenomenon has not changed in thousands of years. Yellowstone also has many other spray accurately but not geyser as cycle as Old Faithful.
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