geothermal feature west thumb yellowstone national park usa |
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navigate by keyword : acid bacteria basin bear bison blue caldera ecosystem elk features forest funnel geothermal geyser grizzly heritage hike hiking hot hydrothermal idaho lake landmark montana mount mountain national nature orange outdoors park pine range river service site spring states subalpine supervolcano thermophile thumb tourism tourist tree unesco united usa volcanic volcano west wildlife world wyoming yellow yellowstone |
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Funnel spring in Yellowstone of vivid colors caused by thermophilic bacteria |
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