The microorganisms present at the Grand Prismatic Spring are mostly extreme thermophilic bacteria and archaea. These non-spore-forming thermophiles thrive at their tolerated temperature ranges.
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The colors of Grand Prismatic Spring come from thermophiles: microbes that thrive in scalding water. The green is chlorophyll they use to absorb sunlight.
Swimming in Yellowstone National ParkYellowstone National Park isn't exactly known for its swimming holes. Due to the thermal activity in the park, most rivers and lakes in Yellowstone are closed to swimmers. However, if you're up for an adventure, the park has opened up a few alluring areas to the public.