Give two examples of each : Natural fuel

Explanation

### Step-by-Step Text Solution:

1. **Understanding Natural Fuels**:
- Natural fuels are substances that are derived from natural processes, primarily from the decay of organic matter over millions of years. They are found in nature and are used for energy production.

2. **Examples of Natural Fuels**:
- **Example 1: Coal**
- Coal is a fossil fuel that is formed from the remains of ancient plants that have been subjected to heat and pressure over millions of years. It is primarily used for electricity generation and in industrial processes.
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