Hardy microscopic plants like lime-green Cyanidium algae, thrive in these warm acid waters. These and other microscopic life forms are links to the emergence of life on earth billions of years ago. Clear pools become muddy and boil violently, and some temporarily become geysers. Features that typically behave as geysers may display altered eruption cycles or temporarily cease erupting. New features have been created during a disturbance although they seldom remain long-term attractions in the basin.
Disturbances tend to last from a few days to more than a week.
Why this happens is not fully understood. Features here may be served by multiple geothermal plumbing systems at varying depths. The lack of extensive sinter buildup around surface vents may allow more recycling of hot water into the shallow portions of the plumbing system. Further study will no doubt yield new clues that will help unravel the mystery of this phenomenon and lead to a greater understanding of the earth's hidden geologic forces. Emerald Spring Back Basin In Emerald Spring, the blue of clear water combines with the yellow of the sulfur-coated crater to create a magnificent green color.