Across
- 4. When something is not dirty.
- 7. The brown soft material that covers some of the ground.
- 8. When an object is reused to make another object.
- 11. A large body of water.
- 13. What all animals in the wild are called.
- 14. Everything that surrounds all living things.
- 15. The gas that humans breathe in to survive.
Down
- 1. Damage to the air or environment.
- 2. The type of energy that comes from the sun.
- 3. When an animal is at risk of becoming extinct.
- 5. The study of living things and their environments.
- 6. The layers of gases surrounding our planet.
- 9. The type of gas that trees take in.
- 10. A large outdoor location that has many trees.
- 12. The weather conditions in a certain area over a long amount of time.