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Putting the color in Yellowstone's famed thermal springs
Putting the color in Yellowstone's famed thermal springs

They've thrilled visitors to Yellowstone National Park for well over a century -- simmering ponds of brilliant, rainbow colors with unforgettable names like Grand Prismatic Spring and Sapphire Pool. Yet not all of Yellowstone's famed thermal pools were always the riot of color they are today. In fact, long before this volcanic region of Wyoming, Montana and Idaho was made a national park in 1872,  the now yellow, green and blue Morning Glory Pool was most likely a pond of deep blue. In research published Friday in the journal Applied Optics, scientists used computer modeling to turn back the clock and examine what Morning Glory and other magma-heated pools probably...

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