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Yellowstone tourists blamed for ruining pristine blue thermal poolMorning Glory Pool, located in the Yellowstone Upper Geyser ... thrive in the pool as a result of the cooler water, slowly ...
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Yellowstone National Park's famous thermal pool ruined by tourists' ‘good luck’ coinsMike Poland, scientist-in-charge of the Yellowstone Volcano Observatory, said, “Hotter pools tend to be a brilliant blue, and cooler pools can be more colorful since bacteria can grow there.” ...
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