Across
- 2. The smallest planet in the solar system
- 5. A major cause of air pollution
- 7. The only planet where life exists
- 8. Kills animals, plants and trees
- 10. The second closest planet to the sun
Down
- 1. Form of life that no longer exists
- 3. Without what food can't grow
- 4. What must be right for life to exist
- 6. Another cause of pollution
- 9. What produces the air that we breathe?