Across
- 4. The protection and preservation of the natural environment.
- 6. Animals and plants that live or grow in the wild.
- 9. The process of making something impure or poisonous.
- 10. Harmful or poisonous substances introduced into the environment.
- 11. A biological community of interacting organisms and their environment.
- 12. An overflow of a large amount of water onto normally dry land.
- 14. The variety of plant and animal life in a habitat.
Down
- 1. The process of converting waste into reusable material.
- 2. A sudden and violent shaking of the ground.
- 3. A large, destructive fire that spreads quickly over woodland.
- 4. The action of using up a resource.
- 5. A long period of abnormally low rainfall and water shortage.
- 7. The clearing or thinning of forests by humans.
- 8. The layer of gases surrounding the Earth.
- 13. A colorless gas that is necessary for most living organisms to breathe.