Across
- 1. to threat things that have already been used so they can be used again
- 5. contamination of the earth
- 8. odourless gas that is present in the earth and necessary to maintain life
- 9. conversion of forested areas to non-forest land for agriculture, urban use, development, or wasteland.
- 11. the natural home or environment of an animal, plant or other organism
- 12. Gradual warming of earth's surface temperature caused by the emission of gases that trap the sun's heat in the earth atmosphere.
Down
- 2. One of the aim of Green Society is to spread awareness of protecting the ____________.
- 3. a biological community of interacting organisms and their physical environment.
- 4. the feeding relationships between species within an ecosystem.
- 6. prevention of wasteful use of a resource.
- 7. sun energy
- 10. 2nd April