Morning Glory Lake (Morning Glory Pool) is located in the United States National Park "Yellowstone", the famous geysers and hot springs.
The crystal-blue lake was colored by the growth of bacteria that have emerged since the fall of the water temperature from 100 to 75-50 degrees Celsius. The reason for this, many see tourists throwing coins, stones and debris in the basin of the lake, leading to clogging vents, warming up water.
At present, the temperature of the source is changed in one direction and then the other, depending on weather conditions. As a result of changes and color.
Periodically, park rangers are trying to clean up the source, but it is of little use.