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Yellowstone NP, Wyoming
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The pool's color has changed over time due to human activity, with coins and debris altering its natural hue. Source
The pool was named for its resemblance to the morning glory flower, with its once brilliant blue color. Source
The pool's temperature can reach up to 171°F (77°C), making it inhospitable for most life forms. Source
It is one of many hot springs in Yellowstone National Park, which sits atop a supervolcano. Source
Park officials have attempted to remove debris to help restore the pool's original blue color. Source
Visitors have been drawn to its beauty since the early 1900s, making it a longstanding feature of Yellowstone. Source
