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← GeographyWhich geomorphic outcome indicates speleothem deposition within underground karstic caves?
A)Decreasing cave air carbon dioxide✓
B)Elevated groundwater silicate weathering
C)Increased hydrothermal vent activity
D)Subsidence from soil overburden stress
💡 Explanation
A decrease in carbon dioxide favors precipitation of calcium carbonate, leading to speleothem formation by the mechanism of chemical precipitation, because dissolved CO2 escapes the groundwater solution during degassing. Therefore, deposition occurs rather than dissolution because the chemical equilibrium shifts.
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