Which of these fuels is not a fossil fuel?

Options

A. Coal
B. Wood
C. Petroleum
D. Natural gas

Answer

To determine which of the listed fuels is not a fossil fuel, we need to understand what fossil fuels are and how they are formed.

### Step-by-Step Solution:

1. **Definition of Fossil Fuels**: Fossil fuels are natural substances formed from the remains of dead plants and animals that have been subjected to heat and pressure over millions of years. Common fossil fuels include coal, petroleum, and natural gas.

2. **Formation Process**: The formation of fossil fuels involves the decomposition of organic matter (dead plants and animals) in an environment with extreme pressure and absence of air (anaerobic conditions). This process can take thousands to millions of years.

3. **Identifying the Fuels**:
- **Coal**: Formed from ancient plant material, it is a well-known fossil fuel.
- **Petroleum**: Derived from the remains of marine organisms, it is also classified as a fossil fuel.
- **Natural Gas**: Often found alongside petroleum, it is formed from the same organic materials and is considered a fossil fuel.
- **Wood**: While wood comes from trees (which are organic), it is not formed through the geological processes that create fossil fuels. Instead, it is a renewable resource that can be replenished relatively quickly.

4. **Conclusion**: Among the options provided, wood is not a fossil fuel. Therefore, the correct answer is that wood is the fuel that is not a fossil fuel.

### Final Answer:
Wood is not a fossil fuel.