Yellowstone is the first national park in the world (established in 1872), and also the largest U.S. national park. The overwhelmingpart of it lies on the territory of the state of Wyoming. It is a volcanic plateau in the Rocky Mountains, full of mountains, lakes and forests. Other attractions of this area are the cliffs made of black obsidian and thousands of geysers and hot springs.The term comes from the Icelandic geyser geysa words that mean burst or gush. Deep below the earth surface structure are very hot rocks. They heat the filling hole or channel water to the boil, then boiling water and steam will be thrown to a considerableheight.
After emptying the geyser channel gradually fills with water again in August and the process repeated. Old Faithful geyser is activecontinuously for at least 200 years. Every hour 45 thousand. liters of boiling water is thrown away for 5 minutes at the height of 30-45 meters.
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