Yellowstone's Famed Thermal Pools Got Their Unique Colors from Pollution, New Study Finds

December 21, 2014 4:59 PM

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The fascinating thermal pools of Yellowstone National Park were not always colored the way they are and got that way essentially through pollution.

According to the Los Angeles Times, authors of a study published in the journal Applied Optics found the pools were probably once blue. With names like Morning Glory Pool, Grand Prismatic Spring and Sapphire Pool, the famous thermal pools now give off colors of the rainbow.

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