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United States

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Grand Prismatic Spring in Yellowstone National Park is the largest hot spring in the US, and the third largest in the world. The vivid colors in the spring are the result of microbial mats around the edges of the mineral-rich water. Image courtesy of the US National Park Service/Jim Peaco.

Grand Prismatic Spring in Yellowstone National Park is the largest hot spring in the US, and the third largest in the world. The vivid colors in the spring are the result of microbial mats around the edges of the mineral-rich water. Image courtesy of the US National Park Service/Jim Peaco.

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