Across
- 3. (Home of animals)
- 4. energy (Energy from the sun)
- 6. energy (Using less electricity)
- 8. (Cutting down many trees)
- 13. (Trash that is hard to compost)
- 17. (Too much water after heavy rain)
- 18. dioxide (Gas from cars and factories)
- 19. change (Weather changes for a long time)
- 20. (Using old things again)
Down
- 1. pollution (Dirty water in rivers or seas)
- 2. (Many kinds of plants and animals)
- 5. layer (Layer that protects Earth from the sun)
- 7. (Protecting nature)
- 9. (Planting trees again)
- 10. pollution (Dirty air from cars and factories)
- 11. (Things that make the environment dirty)
- 12. energy (Energy from wind)
- 14. warming (When the Earth becomes hotter)
- 15. animals (Animals that may disappear)
- 16. (Place to throw garbage)