Across
- 3. substance or thing that has harmful to the environment
- 4. A harmful synthetic material
- 5. the variety of all living things and their interactions
- 8. the natural home or environment of an animal, plant, or other organism
Down
- 1. Use again
- 2. the layers of gases surrounding a planet or other celestial body
- 6. the action of clearing a wide area of trees
- 7. (A species)no longer in existence