Jeff Vanuga / Aerial view of Grand Prismatic Springs Midway Geyser Basin. Yellowstone National Park, Wyoming, July 2011.
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Paul D Stewart / Aerial view of Grand Prismatic thermal spring in Yellowstone National Park, USA. The bright colours are natural, coming from thermophile bacteria in the water. People can be seen walking on the raised...
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Peter Cairns / Parched trees in front of Grand Prismatic Spring geothermal area, Yelowstone National Park, Wyoming, USA, September 2008
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Tim Fitzharris / Tourists viewing Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, Wyoming
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Jim Brandenburg / Aerial view of Grand Prismatic Pool, Yellowstone National Park, Wyoming
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Jim Brandenburg / Aerial view of Grand Prismatic Pool in winter, Midway Geyser Basin, Yellowstone National Park, Wyoming
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Hermann Brehm / Grand Prismatic Spring in Midway Geyser Basin, Yellowstone NP, Wyoming, USA.
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Jeff Vanuga / Aerial view of Grand Prismatic Springs Midway Geyser Basin. Yellowstone National Park, Wyoming, July 2011.
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Ingo Arndt / Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, Wyoming
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Ingo Arndt / Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, Wyoming
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Ingo Arndt / Tourists viewing Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, Wyoming
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Ingo Arndt / Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, Wyoming
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Jack Dykinga / Rivers of red algae across bacterial mats, at sunset, Grand Prismatic Geyser, Yellowstone National Park, Wyoming, USA
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Peter Cairns / Tourists on boardwalk in Grand Prismatic Spring geothermal area, Yellowstone National Park, Wyoming, USA, September 2008
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Jeff Vanuga / Thermal runoff from Grand Prismatic Spring into the Firehole River, Yellowstone National Park, Wyoming, USA, October 2008
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Yva Momatiuk & John Eastcott / Hikers admiring Grand Prismatic Pool, Yellowstone National Park, Wyoming
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Yva Momatiuk & John Eastcott / Bacterial mats in Grand Prismatic Pool, Yellowstone National Park, Wyoming
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Yva Momatiuk & John Eastcott / Bacterial mats in Grand Prismatic Pool, Yellowstone National Park, Wyoming
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Yva Momatiuk & John Eastcott / Sky reflected in Grand Prismatic Pool, Yellowstone National Park, Wyoming
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Jeff Vanuga / Grand Prismatic Spring in Midway Geyser Basin, Yellowstone National Park, Wyoming, USA
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Jeff Vanuga / Aerial view of the Grand Prismatic Spring in Midway Geyser Basin, Yellowstone National Park, Wyoming, USA
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Yva Momatiuk & John Eastcott / Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, Wyoming
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George McCarthy / Grand Prismatic Spring, Yellowstone National Park, Wyoming, USA
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Jack Dykinga / Grand prismatic pool at dawn with terraces of bacteria mats and red algae in foreground, Yellowstone NP, Wyoming, USA
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Hermann Brehm / Grand Prismatic Spring in Midway Geyser Basin, Yellowstone NP, Wyoming, USA
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Hermann Brehm / Close up of Grand Prismatic Spring in Midway Geyser Basin, Yellowstone NP, Wyoming, USA
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Tim Fitzharris / Steam rising off Grand Prismatic Pool in Midway Geyser Basin, Yellowstone National Park, Wyoming
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Jim Brandenburg / Aerial view of Grand Prismatic Pool, Yellowstone National Park, Wyoming
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Ingo Arndt / Burned trees in front of Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, Wyoming
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Ingo Arndt / Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, Wyoming
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Suzi Eszterhas / American Bison (Bison bison) tracks at the steaming Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, Montana
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Jim Brandenburg / Aerial view of Grand Prismatic Pool, Yellowstone National Park, Wyoming
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Jim Brandenburg / Aerial view of Grand Prismatic Pool, Yellowstone National Park, Wyoming
