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← GeographyWhich mechanism primarily drives stalactite formation from cave ceilings?
A)Carbonate precipitation from evaporating dripping water✓
B)Oxidation-reduction of iron-rich groundwater
C)Mechanical erosion by abrasive turbulent flow
D)Biogenic accumulation of microbial sedimentary layers
💡 Explanation
Dissolved calcium carbonate precipitates out of groundwater due to evaporation. This carbonate precipitation mechanism builds up layers over time, therefore stalactites form from the top-down, rather than erosion or biological accruement from the cave bedrock.
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