Across
- 2. the invisible mixture of gases that surrounds the Earth and forms its atmosphere.
- 5. all the surrounding living and non-living factors such as air, water, land and organisms.
- 6. the process of collecting and converting waste materials into new products.
- 7. a large body of salt water.
- 9. the act of using an item again.
Down
- 1. the introduction of harmful substances into the natural environment.
- 3. the rapid oxidation of a material releasing heat and light.
- 4. a large, dense area of land dominated by trees and other vegetation.
- 6. a synonym for garbage or trash.
- 8. the third planet from the Sun.