Across
- 3. - Coal oil and gas used for energy
- 7. - When a species no longer exists
- 11. - Long term change in Earths temperature
- 17. - Using resources without running out
- 18. - Harmful gases in the air
- 19. - Increase in Earths average temperature
- 20. - Unwanted or unusable materials
Down
- 1. - Cutting down large areas of forest
- 2. - Trapping of heat in Earths atmosphere
- 4. - Protecting and preserving the environment
- 5. - Catching fish faster than they reproduce
- 6. - Variety of living organisms in an area
- 8. - Waste entering oceans and harming life
- 9. - Reusing materials to reduce waste
- 10. - Energy from sources like sun or wind
- 12. - A community of living and nonliving things interacting
- 13. - When animals lose their natural home
- 14. - Harmful substances added to the environment
- 15. - Gas that contributes to global warming
- 16. - Contamination of water sources