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← GeographyWhich mineral precipitation governs speleothem (cave formation) growth rates?
A)Calcium carbonate saturation index✓
B)Gradient of regional temperatures
C)Dissolved silica supersaturation degree
D)Ferrous oxide concentration threshold
💡 Explanation
The calcium carbonate saturation index determines speleothem growth by controlling calcium carbonate deposition from groundwater via a process called precipitation equilibrium, because greater saturation leads to faster deposition; therefore, index strength is central rather than another gradient.
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