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Mudpot
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Mudpot at Fountain Paint Pot. Midway & Lower Geyser Basin.
Where hot water is limited and hydrogen sulfide gas is present (emitting the "rotten egg" smell common to thermal areas), sulfuric acid is generated. The acid dissolves the surrounding rock into fine particles of silica and clay that mix with what little water there is to form the seething and bubbling mudpots.
Source: National Park Service
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