Pinto Spring with Gem Pool in background, Cascade Group, Upper Geyser Basin, Yellowstone NP, Wyoming, USA

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Photo credit: © Duncan Usher / Alamy / Afripics
License: Licensed
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Keywords: activity, bacteria, bacterial, basin, cascade, colorful, geyser, group, national, northwestern, park, pinto, spring, summer, upper, usa, vivid, volcanic, wyoming, yellowstone