Issue Date: July 23, 2012
Geologic Sulfur Cycle Reexamined
Earth’s sulfur cycle is more varied and has greater effects on marine chemistry, the carbon cycle, atmospheric oxygen levels, and climate than previously realized, according to two reports in Science (DOI: 10.1126/science.1220656 and 10.1126/science.1220224). Sulfate from dissolved minerals such as anhydrite (CaSO4) or from oxidative weathering of pyrite (FeS2) gets carried by rivers into . . .
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