Across
- 5. environmental habitat
- 7. release of gas into the air
- 10. animals/humans inhale it
- 11. sand is the main ingredient
- 13. energy from the sun
- 14. a synthetic material, often molded
- 16. aluminum, iron, and copper are all examples
- 18. use less
- 21. poisonous
- 22. use again, more than once
- 24. method of waste disposal
- 25. made from trees
- 26. might be recycled to make a playground surface
Down
- 1. important layer in the earth's atmosphere
- 2. organic fertilizer
- 3. toxic vapors
- 4. broken down by microorganisms
- 6. used to make gasoline
- 8. methane and butane are examples
- 9. we only have one!
- 12. essential fluid for life
- 15. a discarded material
- 17. surroundings
- 18. convert waste into a usable material
- 19. recyclable metal tins
- 20. oil is an example of this
- 23. some sources of this are renewable