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Grand Prismatic Spring, Yellowstone National Park, Wyoming
This is at the north end of the main spring, just before the walkway starts back towards the parking log.  You can see the nearby denuded hills, defoliated by the terrible 1988 fires that wiped out almost half of the park's forests.  The foreground is made interesting by yet more terraces of minerals and yet different bacteria or algae, this time of a brownish color.
©2003, Jeffrey L. Cooper

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