Across
- 2. worthless or of no use
- 4. materials that harm the environment
- 6. prevent waste of resources like water
- 7. substances used to kill pests
- 9. power for light, heat and machines
- 11. energy sources like wind and sun
- 15. this has five layers
- 17. living matter. Food with no pesticides
Down
- 1. heat-trapping gas
- 3. energy source formed millions of years ago
- 5. trash left out in the open
- 8. to collect materials to be used again
- 10. relating to or involving the planet
- 11. we need these to support ourselves
- 12. the natural world as impacted by humans
- 13. made up of mostly nitrogen and oxygen
- 14. the planet we live on
- 16. how organisms relate to each other
- 18. general weather over a period of time