Name three common forms of `CaCO_3`.

Explanation

To answer the question "Name three common forms of CaCO₃", we can follow these steps:

### Step 1: Understand the Chemical Compound
- Calcium carbonate (CaCO₃) is a chemical compound that occurs naturally in various forms.

### Step 2: Identify Common Forms
- There are several common forms of calcium carbonate. We need to identify at least three of them.

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