article_snippet: Morning Glory in Yellowstone National Park was once a brilliant shade of blue, but now owes Morning Glory in the Yellowstone National Park yellow tinge to debris and coins thrown in over the years .
article_snippet: Adam Hoffman from Science Friday said: 'Pigments produced by swaths of those microbes—called microbial mats—are responsible, at least in part, for the brilliant yellows, greens, and oranges that now tinge Morning Glory and other thermal pools in Yellowstone.'
article_snippet: Unless some subterranean shift happens where more hot water can again flow to the surface, Morning Glory will never be fully blue again .
highlights_snippet: Morning Glory in Yellowstone National Park has drastically changed from crystal blue to a yellowy-green hue .
  