Question : Stalactites and Stalagmites form due to the precipitation of:
Option 1: CaCO3
Option 2: CaCl2
Option 3: MgCl2
Option 4: MgCO3
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Correct Answer: CaCO 3
Solution : The correct option is CaCO 3 .
Stalactites and stalagmites form in caves due to the precipitation of calcium carbonate (CaCO 3 ). Rainwater, slightly acidic from absorbing carbon dioxide, dissolves calcium carbonate as it seeps through rocks. This dissolved mineral is deposited inside a cave when the water drips from the ceiling and forms stalactites. On the cave floor, the deposited mineral forms stalagmites as water droplets containing dissolved calcium carbonate evaporate and leave the mineral behind.
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