Across
- 5. a gas people and animals breathe out
- 6. things from nature we use (water, trees)
- 7. when animals or plants all die
- 8. to stay alive
- 10. fuel like oil, gas, or coal
- 11. changes in weather over a long time
- 12. the world around us (air, water, land)
Down
- 1. bad rain that can destroy plants and buildings
- 2. animals or plants that may die out soon
- 3. gases from cars or factories
- 4. a person who helps for free
- 9. dirty things in air, water, or land