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| Boardwalks, the foremost means of seeing the sights in Yellowstone. |
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| A bubbling geyser in the lower basin. |
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| A fumarole. A hot spot in the ground. |
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| Crystal blue hot pools. |
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| Bubbling paint pots. |
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| The steamy smell of rotten eggs. |
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| Bacteria can be pretty. |

Labels: Yellowstone National Park
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