### Unraveling the Secrets of Calcium Carbonate Formula.
1. What is calcium carbonate?
2. How is calcium carbonate formed?
### Answer:
1. Calcium carbonate is a chemical compound with the formula CaCO3. It is a common substance found in rocks as the minerals calcite and aragonite, and is the main component of pearls and the shells of marine organisms such as snails and oysters.
2. Calcium carbonate is formed through a process called sedimentation, where calcium ions in water combine with carbonate ions to form solid calcium carbonate. This can occur in oceans, where marine organisms such as corals and plankton extract calcium and carbonate ions from seawater to build their shells and skeletons. Over time, the accumulated calcium carbonate can form rocks such as limestone and chalk through the settling and cementation of these organic remains. Additionally, calcium carbonate can also be precipitated directly from water, such as in the formation of stalactites and stalagmites in caves, where calcium-rich groundwater drips from the ceiling and reacts with carbonate ions in the air to form solid calcium carbonate deposits.
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