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Black Pool<br> Yellowstone Nat. Park picture - is now a beautiful blue pool. It use to be black when the water temperature was lower allowing for certain microorganisms to grow in the pool. In 1991 the temperature rose and killed those organisms.
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image -- 2592 x 1952)
is now a beautiful blue pool. It use to be black when the water temperature was lower allowing for certain microorganisms to grow in the pool. In 1991 the temperature rose and killed those organisms.
North America
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image -- 2592 x 1952)