Colored by Soil?
Photo by Henry Holdsworth, courtesy of Robert B. Smith
 
On the Rise
Grand Prismatic Spring, Yellowstone National Park, captures the essence of Yellowstone's world-renowned geysers and hot springs that are fed by the enormous heat from its active volcanic system. This 200-foot-wide, boiling hot spring has an array of vivid colors produced by thermophile bacteria that thrive in hot water.
 
 
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