Across
- 3. energy with wind, water, or the sun
- 6. large rocks that can hit the earth
- 10. when the earth's temperature changes
- 11. unwanted material in all forms that can cause harm
Down
- 1. teacher's favourite fruit
- 2. reusing your trash
- 4. happened to the dinosaurs
- 5. when you cut down all the trees in an area
- 7. comes from factories
- 8. being careful with how much energy you use
- 9. like armstrong
- 12. conservation