Across
- 4. The introduction of harmful materials into the environment.
- 5. Protect from harm or destruction.
- 7. Trash that is left lying in the open or in public.
- 9. The natural home or environment of an organism.
- 10. A biological community of interacting organisms.
Down
- 1. Decayed organic material used as a planet fertilizer.
- 2. The sun's rays as energy to power things.
- 3. Maintain in its original or existing state
- 6. The mixture of gases surrounding a planet.
- 8. A system of trash and garbage disposal in which the waste is buried.