Morning Glory Pool, Yellowstone National Park, USA. A unique hot spring is called after a Morning Glory flower, because it looks like it. The coloration, seen through crystal clear water, is caused by bacterias. Morning Glory sometimes acts like a geyser: it has erupted a couple of times.
Some tourists treat this natural wonder as a fountain and throw coins or other objects into it. This practice has clogged the pool and even disrupted the hot springs. It caused changes of the temperature and bacterias, therefore the color of the pool has changed over the years.
Photo by Evergreen Photography
Photo by Dan Anderson
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Photo by Alamy
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