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VIDEO: Tourist ignores warnings, dips foot in hydrothermal pool at Yellowstone National Park | outtherecolorado.com
Yellowstone National Park - What's the difference between a hot spring and a geyser? Plumbing! Unlike geysers, hot springs (such as Sapphire Pool) do not have constrictions in their plumbing systems. Superheated
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Ask Dr. Universe: Why do bacteria in the Yellowstone hot springs make the water different colors? | The Spokesman-Review
![Yellowstone Park hot spring turned green by good luck coins tossed in by tourists | The Independent | The Independent Yellowstone Park hot spring turned green by good luck coins tossed in by tourists | The Independent | The Independent](https://static.independent.co.uk/s3fs-public/thumbnails/image/2015/03/14/16/Yellowstone2.jpg?width=1200)