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FILE — Grand Prismatic Spring at Yellowstone National Park in Wyoming, Aug. 30, 2017. Volcanic activity is responsible for some of the park’s most spectacular sights. (Janie Osborne/The New York Times)

FILE — Grand Prismatic Spring at Yellowstone National Park in Wyoming, Aug. 30, 2017. Volcanic activity is responsible for some of the park’s most spectacular sights. (Janie Osborne/The New York Times)