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← GeographyWhich feedback causes speleothems to increase deposition rates?
A)Decreased mineral saturation in dripwater
B)Increased CO2 partial pressure outside
C)Thickness-enhanced film fluid dynamics✓
D)Reduced airflow and evaporation effects
💡 Explanation
Increased stalactite thickness enhances transport in the water film via thickness-enhanced film fluid dynamics, promoting crystal growth; because a positive feedback loop exists, increasing the thickness increases deposition, rather than other factors suppressing it. Therefore, thickness directly increases deposition.
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