I found this interesting:
Quote:
Yellowstone's thermal waters range from acidic steam vents (sometimes called fumaroles) and mud pots to hot springs and bursting geysers like Old Faithful. Though their colors, sizes and even smells vary greatly, nearly all of the park's hydrothermal features fall within two categories. [Infographic: The Geology of Yellowstone]
Yellowstone's geysers and hot springs are rich in chlorine and silica and have a pH around 9. (Pure water is given a pH of 7. A pH above 7 indicates basic water, while a pH below 7 indicates acidic water.) They make up around 80 to 90 percent of the park's total water discharge, Lowenstern said.
Acid mud pots and fumaroles, on the other hand, are rich in sulfuric acid and have a pH as low as 2. While their total volume is miniscule compared with geysers and hot springs, these acidic waters are much more widespread and cover a greater percentage of the park's land.
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