Across
- 1. Variety of life in an ecosystem
- 6. A group of organisms capable of interbreeding
- 7. Water that is not salty
- 8. The layer of gases surrounding Earth
- 12. To set free or allow to escape
- 13. To keep safe from harm or danger
- 15. A community of living organisms and their environment
- 16. Animals and plants living in the wild
- 17. A large celestial body orbiting a star
- 18. Physical damage or injury
Down
- 2. To lessen the amount or intensity
- 3. Area of land drained by a river and its tributaries
- 4. To use again
- 5. Long-term weather patterns in a region
- 9. Surroundings in which organisms live
- 10. Protection and preservation of natural resources
- 11. Natural home or environment of an organism
- 12. To process materials for reuse
- 14. Relating to the entire world
- 15. Our home planet