Across
- 3. a layer of atmospheric oxygen
- 6. the animals common to a specific area
- 8. at risk of dying out or becoming extinct
- 9. the artificial application of water to land
- 10. all of an area's living and nonliving things
- 14. science of farming, taking care of crops
- 18. something presented in a new form
- 19. natural wearing away of the earth's surface
- 20. a hard form of carbon used for gems or cutting
Down
- 1. the eradication or annihilation of a species
- 2. preservation of wildlife and natural resources
- 4. place where an animal or plant normally lives
- 5. series of stages in one's existence
- 7. the natural surroundings of living things
- 11. ability to endure, exist, or stay alive
- 12. plants of a certain region
- 13. a storage place to grow plants out of season
- 15. area of grass set aside for animals to eat
- 16. the amount of salt in something
- 17. pertaining to rural areas