Across
- 2. action of clearing a large area of trees
- 5. where fresh water meets salt water
- 7. harmful material
- 8. chemical used to kill insects
- 10. species that dies out/no longer exists
- 13. impact of a person or community on the environment
- 14. coal, oil, natural gas and other fuels that are remains of organisms
- 15. measure of human impact on environment
- 16. convert waste into reusable material
- 17. forms in atmosphere when gas emissions combine with water
- 19. chemical used to kill insects and other organisms that damage crops
- 20. group of chemical compounds used in refrigerators
- 21. species who is at risk of extinction
Down
- 1. raising marine and freshwater fish in ponds and underwater cages
- 3. development of industries for machine production of goods
- 4. increase of things living in an area
- 6. breakup of a habitat into smaller pieces
- 9. largest number of a population an environment can support
- 11. process where fertile land becomes desert due to drought or deforestation
- 12. protecting and preserving natural resources and the environment
- 18. protective layer in atmosphere that shields earth from uv radiation