firehole spring crystal clear blue thermal feature yellowstone national park usa |
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| navigate by keyword : abstract america area background bacteria basin blue clear colorful copy crystal drive environment extreme extremophiles feature firehole fountain geyser great group historic hydrothermal lake landscape lower microorganisms national nature north orange outdoors outside park space spring states summer thermal thermophiles thermophilic united usan yellowstone |
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| Firehole Spring crystal clear blue thermal feature, Yellowstone National Park, USA |
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