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← GeographyWhich outcome occurs when atmospheric CO2 decreases globally?
A)Reduced carbonate deposition in ocean sediments
B)Slower stalactite formation in limestone caves✓
C)Increased methane release from permafrost
D)Faster chemical weathering of silicate rocks
💡 Explanation
Slower stalactite formation occurs due to decreased dissolved bicarbonate. A drop in atmospheric CO2 reduces carbonic acid formation in rainwater and cave systems, which limits limestone dissolution via the chemical weathering mechanism called carbonation. Therefore carbonate precipitation slows in these cave features rather than accelerating it.
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