Across
- 3. growing of crops
- 4. an area's typical temperature
- 5. study of ecosystems
- 6. preserved remains of plants
- 7. group of organisms who can breed
- 9. a term for something that isn't living
Down
- 1. non native
- 2. introduction of harmful materials into an environment
- 3. gases around the earth that keep it safe
- 8. surface streams and underground water