Right on the edge of one of the most active areas of Yellowstone's geothermal activity, Sulphur Caldron churns away, bubbling with hydrogen sulfide released by gasses rising from the magma chambers below. While supporting a pH roughly equivalent with battery acid, Sulphur Caldron is still full of life! Microbes called thermoacidophiles survive by converting the hydrogen sulfide gas into sulfuric acid for energy, thriving in the extreme environment in a way nothing else on earth could.
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