Our world

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