Chemistry — Chemical Weathering
Carbonate and silicate weathering as carbon sinks.
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\text{CO}_2 + \text{H}_2\text{O} + \text{CaCO}_3 \rightarrow \text{Ca}^{2+} + 2\text{HCO}_3^-
\text{acidic rain dissolves carbonates}
\text{silicate weathering removes CO}_2
\text{a long-term carbon sink}