Across
- 3. Area full of trees
- 5. Relating to the world
- 7. Green living thing
- 8. Our planet
- 12. Gas that plants give
- 13. Energy from water
- 16. To protect the earth
- 17. Everything not man-made
- 19. Special day for earth
- 22. Not dirty Relating to the world
- 23. Not cold
- 25. The star that gives light
- 26. A tall plant with wood
- 28. Energy from moving air
- 29. Ice turning into water
- 30. To use less
- 31. Frozen water
- 33. A harmful material waste
- 34. Clear liquid we drink
- 36. Big water in land
- 38. Place where animals live
- 39. Color of nature
Down
- 1. Invisible air substance
- 2. Dirty air
- 4. Ground where plants grow
- 6. To keep safe
- 9. To save resources
- 10. Repeating process
- 11. We breathe it
- 14. A very large salty water
- 15. Gas from cars
- 18. Waste that can be used again
- 19. Power we use
- 20. Flowing water
- 21. Rubbish or trash
- 24. Living thing not plant
- 27. Cutting too many trees
- 32. Weather over long time
- 35. Use less
- 37. Water from clouds