Emerald Pool At Yellowstone National Park. Emerald Pool At Black Sand Basin, An Group Of The Upper Geyser Basin, Is So Named Because Of The Small Fragments Of Black Obsidian Sand Which Cover Portions Sand Which Cover Portions Of The Basin. Emerald Pool Is The Most Colorful And Famous Of These Springs. It Is A Deep Emerald Green Fringed By An Outer Ring Of Yellow And Orange. The Color Is The Result Of Lower Temperatures Which Have Allowed Yellow Bacteria And Algae To Grow On The Lining Of The Pool. The Clear Water Of The Pool Reflects The Blues But Absorbs The Other Hues Of The Color Spectrum. The Combination Of Blue And Yellow Then Produces Green. Objects Thrown Into The Pool And Natural Debris Have Caused A Further Decrease In Temperature, Resulting In A Change Of Bacteria And Algae Growth And Thus A Change Of Color. The Edge Of The Pool Is Now Orange And Brown.

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