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| Emerald Pool. Image ID: 13507 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA | A visitor photographs Emerald Pool. Image ID: 13508 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA | Emerald Pool. Image ID: 13509 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA |
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| Sunset Lake. Image ID: 13510 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA | Colorful bacteria mats mark the runoff from Sunset Lake. Image ID: 13511 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA | Green Spring. Image ID: 13512 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA |
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| Iron Spring Creek flows in front of Green Spring. Image ID: 13513 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA | Cliff Geyser. Image ID: 13514 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA | Cliff Geyser. Image ID: 13515 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA |
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| Cliff Geyser. Image ID: 13516 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA | Cliff Geyser. Image ID: 13517 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA | Spouter Geyser erupts a few feet high, lasting for several hours followed by quiet period of a few hours. Image ID: 13518 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA |
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| Spouter Geyser erupts a few feet high, lasting for several hours followed by quiet period of a few hours. Image ID: 13519 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA | Spouter Geyser erupts a few feet high, lasting for several hours followed by quiet period of a few hours. Image ID: 13520 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA | Emerald Pools vibrant colors are caused by themophilic (heat-loving) cyanobacteria and algae. As the temperature of the pool decreases towards its edges, the colors tend to oranges and yellow. Black Sand Basin. Image ID: 07302 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA |
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| Rainbow Pool, a broad (50 foot diam) heated pool in Black Sand Basin, will rarely erupt. Usually it is calm and mildly overflowing, allowing colorful thermophilic cyanobacteria and algae to grow around its edges. Image ID: 07303 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA |
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