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Which risk increases where agricultural runoff infiltrates karst cave systems?

A)Enhanced speleothem calcite deposition
B)Increased biogenic silica precipitation
C)Accelerated cave passage enlargement
D)Decreased hypogenic sulfide oxidation

💡 Explanation

Increased agricultural runoff introduces excess nutrients. This accelerates biological activity and carbon dioxide production via microbial respiration, driving dissolution of limestone through the mechanism of carbonic acid weathering. Therefore cave passages enlarge faster, rather than mineral precipitation.

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