Bacterial mats in runoff water, Grand Prismatic Spring, Midway Geyser Basin, Yellowstone NP, Wyoming

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Photo credit: © Duncan Usher / Alamy / Afripics
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Keywords: activity, attraction, bacteria, bacterial, basin, beautiful, geyser, grand, hot, midway, national, natural, nature, np, park, prismatic, reserve, runoff, spring, summertime, tourist, usa, volcanic, water, wyoming, yellowstone