Cave formations like Blanchard Springs Caverns (Fifty-Six, AR) are very sensitive to atmospheric CO2 levels. The pertinent reaction is: CaCO3(s) + CO2(g) + H2O(l) ↔ Ca2+(aq) + 2HCO3-(aq). If atmospheric CO2 levels begin to fall, what effect is this predicted to have on the rock formations in these caves? CaCO3(s) will be depleted; CaCO3(s) will be unaffected, but the rock formations will become depleted; More CaCO3(s) will form; The moisture content in the rock formations will decrease.