Kawah Ijen's crater lake measures more than half a mile in diameter and its volume is more than 40 million cubic yards (i.e., larger than the combined volume of all NFL football stadiums). Though both car batteries and Kawah Ijen's lake are primarily composed of the same sulfuric acid, Kawah Ijen's sulfur is tapped naturally from its volcanic host. The sulfur gases are mostly "scrubbed" by the circulating water of the hydrothermal system, which is linked to the lake above.
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