What puts color in Yellowstone's famed thermal springs

December 21, 2014 11:19 AM

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Hundreds of people visit the famed thermal pools of Yellowstone each year but it is to be noted that these pools were not always as colorful as they are today.

In 1872, the government decided to make the volcanic region of Wyoming, Montana and Idaho a national park and long before that the now yellow, green and blue Morning Glory Pool was most likely a pond of deep blue.

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