sapphire pool biscuit basin upper geyser basin yellowstone national park wyoming usa united states of america

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Keywords: bacteria, blue, boiling, cinter, colorful, colourful, cyanobacteria, geothermal, hot, national, natural, park, phenomenon, pool, sapphire, sinter, sky, spring, steam, thermal, thermophile, thermophilic, usa, vent, water, yellowstone