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WY_0029_Grand Prismatic Spring Yellowstone.jpg
Grand Prismatic Spring, part of the Midway Geyser Basin in Yellowstone National Park.The Grand Prismatic Spring is the largest hot spring in the United States, and the third largest in the world.<br />
The vivid colors in the spring are the result of pigmented bacteria in the microbial mats that grow around the edges of the mineral-rich water.