How does a fire start?

Explanation

### Step-by-Step Solution:

1. **Understanding Fire**: Fire is a result of a chemical reaction known as combustion, which involves the rapid oxidation of a substance. This process produces heat and light.

2. **Definition of Rapid Oxidation**: Rapid oxidation refers to the quick reaction of a substance with oxygen, leading to burning. This is the fundamental process that creates fire.

3. **Conditions for Fire to Start**: There are three essential conditions that must be met for a fire to ignite:
- **Fuel**: A combustible material that can burn. This can be anything from wood, paper, gasoline, etc.
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