A view of Opal Pool, a hot spring at the Midway Geyser Basin in Yellowstone National Park, Wyoming, US. It usually has a temperature of approximately 132 °F (56 °C). Though usually active as a hot spring, Opal Pool is considered a fountain-type geyser. As the first national park in the world, Yellowstone National Park is well-known for its wildlife and many geothermal features. [Photo by Xu Lin / China.org.cn]
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