This is one of the outflows from the Prismatic Pool in Yellowstone National Park. The steam comes from water bubbling up from volcanic heat pumps deep in the earth's crust. The 640,00-year-old, 45-by-30 mile caldera formed from an eruption of the active volcano forms the center of the National Park. There are more than 10,000 hydrothermal features and 300 active geysers in the park.
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