Echinus Geyser erupting, Yellowstone National Park, Wyoming.

Yellowstone National Park hosts an incredible variety of hydrothermal features, some of the most spectacular being geysers. Geysers are essentially hot springs that periodically erupt by shooting jets of hot water into the air. Echinus Geyser, shown here, lies in the Norris Basin area of the park, on the north side of the Yellowstone Caldera.

click here to see a geologic map of Yellowstone National Park, Wyoming.

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