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← GeographyWhich mechanism allows cave formation in fractured limestone?
A)Aggressive speciation by isolated fauna
B)Differential weathering along bedding planes
C)Biogenic methane oxidizing pH change
D)Fracture-guided carbonic acid dissolution✓
💡 Explanation
Cave formation arises from carbonic acid dissolution because rainwater, charged with CO2, infiltrates limestone fractures to dissolve calcite; therefore a fracture-guided flow path is crucial, rather than solely surface weathering or biogenic effects within enclosed pore spaces.
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