Across
- 2. A fuel derived directly from living matter.
- 4. The action of clearing a wide area of trees.
- 7. A biological community of interacting organisms and their physical environment.
- 8. The variety of life in the world or in a particular habitat or ecosystem.
- 9. The action or process of making or becoming acidic.
- 10. Converting (waste) into reusable material.
Down
- 1. A disease that can be transmitted to humans from animals.
- 3. A substance used for destroying insects or other organisms harmful to cultivated plants or to animals.
- 5. Relating to or living near lakes.
- 6. A substance that is toxic to plants, used to destroy unwanted vegetation.