Yellowstone’s thermal pools are brightly colored because of trash, researchers find

December 21, 2014 3:05 PM

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Trash, coins, and other debris have partially blocked the magma vent, lowering the temperature and allowing microbes to thrive and change the color from deep blue to a rainbow-like hue.

Those brilliant, rainbow-colored hot springs at Yellowstone National Park attract many tourists each year, but they didn’t always look that way, according to researchers.

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