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Description
Grand Prismatic Spring in the Midway Geyser Basin. This spring is the thirdlargest hydrothermal spring in the world, approximately 250 X 300 feet in sizeand about 160 feet deep. The water temperature is 160 F (70 C). The colors onthe edges of the spring are due to thermophile microbial mats that growin the mineral-rich waters. (Image credit: Dr. David Goodrich)