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Comments on Gigapan: Emerald Pool - Yellowstone National Park (WY)

  2. One of the geyser pools in Black Sand Geyser Basin: this is named for it's green color. When the water is still, it's possible to see just how straight and deep the walls of the pool are. The color is due to different bacteria growing inside the pool - if the temperature goes down, the green-ish bacteria die, while...

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