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, bacterial, basin, beautiful, colorful, colors, geyser, grand, hot, midway, national, natural, np, park, prismatic, spring, summertime, tourist, usa, vivid, volcanic, wyoming, yellowstone