geothermal feature old faithful area yellowstone national park usa |
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| navigate by keyword : bacteria basin bear bison blue caldera colorful ecosystem elk features forest geothermal geyser grizzly heritage hike hiking hot hydrothermal idaho landmark lower microbe montana mount mountain national nature outdoors park pine pool range river service shade silex site spring states subalpine supervolcano tourism tourist tree unesco united usa volcanic volcano wildlife world wyoming yellowstone |
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| Silex hot spring in Yellowstone of vivid colors caused by thermophilic bacteria |
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