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← GeographyWhich geomorphic outcome occurs when elevated carbon dioxide concentrations exist within soils overlying limestone bedrock?
A)Accelerated chemical karstification process✓
B)Erosion of surface alluvial textures
C)Increased aggregation of clay minerals
D)Deposition of siliceous biogenic sediments
💡 Explanation
Elevated soil CO2 from biological activity facilitates carbonic acid formation; this accelerates dissolution of limestone via chemical weathering or karstification, because carbonic acid reacts with calcium carbonate. The karst regions form, rather than alluvial erosion, as calcium is slowly chemically mobilized.
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