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← GeographyWhich outcome occurs when groundwater seeping into a limestone cave with localized high CO2 concentration encounters reduced atmospheric CO2 above?
A)Increased stalactite calcium carbonate deposition✓
B)Accelerated cave roof structural collapse
C)Decreased groundwater mineral absorption rate
D)Expansion of subterranean aquifer volume
💡 Explanation
Increased stalactite deposition arises because reduced cave CO2 causes Carbonate Precipitation from supersaturated bicarbonate solutions. Therefore, calcium carbonate deposition increases rather than solution of roof rock because the lower CO2 concentration favors precipitation over dissolution.
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