Across
- 3. Fuels formed from ancient plant and animal remains. (12 letters)
- 6. A long period without rain. (7 letters)
- 7. When there are too many people in one area. (14 letters)
- 8. A type of air pollution that combines smoke and fog. (4 letters)
Down
- 1. Sources of energy that can be replaced naturally. (20 letters)
- 2. Rising water levels that can damage homes. (8 letters)
- 4. Gases that trap heat in the Earth's atmosphere. (17 letters)
- 5. Violent weather conditions with strong winds and rain. (6 letters)