Yellowstone’s rainbow-colored geothermal pools are filled with trash

December 23, 2014 10:18 PM

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Yellowstone’s rainbow-colored geothermal pools are filled with trash

Trash, coins, and other debris have sunk to the bottom and partially clogged the magma vents that heat the pools, causing the temperature of the water to drop, creating microbial mats.

They’re one of Yellowstone National Park’s most iconic attractions: brightly colored bubbling geothermal pools, heated by magma from a simmering volcano below the surface. But they used to be a brilliant blue color many years ago, until humans came along and started throwing trash in them, according...

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