Across
- 3. A place where trash is buried
- 4. Harm to rivers, lakes, and oceans by human actions
- 7. The layer of air that surrounds Earth
- 10. Dirty or harmful air caused by smoke, chemicals, etc.
- 11. Replanting trees where forests were cut down
- 12. Fuels from ancient dead organisms, found in the ground
- 13. When nature is made dirty or harmful
Down
- 1. Everything around us – air, land, water, animals, and plants
- 2. The natural home of a plant or animal
- 5. Damage to land caused by humans
- 6. Trash that breaks down naturally (like food or leaves)
- 8. Cutting down and removing trees
- 9. Something found in nature that people use