Name the fuels that are found in earth's crust.

Explanation

**Step-by-Step Solution:**

1. **Understanding Fossil Fuels**: Fossil fuels are natural substances formed from the remains of ancient plants and animals. They are found deep within the Earth's crust.

2. **Types of Fossil Fuels**: The main types of fossil fuels include:
- **Coal**: Formed from the remains of ancient plants, primarily in swampy areas.
- **Petroleum (Crude Oil)**: Formed from the remains of tiny sea creatures and plants that settled on the ocean floor millions of years ago.
- **Natural Gas**: Often found in association with petroleum and formed from the same organic materials.
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