algae dragon mouth spring |
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| navigate by keyword : attraction boiling caldron chemistry close dragon entrance geological geothermal heat hot hydrothermal mouth national opening park spring springs steam steaming sulphorous sulphur tourism travel vapors water wyoming x27 yellowstone |
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| Boiling hot steam pours from the Dragon's Mouth Spring in Yellowstone National Park. Dark green algae form ragged ring around entrance. |
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