Natural science: Air.

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Across
  1. 3. Soft wind.
  2. 4. Moving air.
  3. 5. The process of something burning.
  4. 8. planes and animals would not be able to ___ without air.
  5. 9. One of the gases that is found in air.
  6. 10. The layer of air that sorrounds the earth.
Down
  1. 1. They produce oxygen and absorb carbon dioxide.
  2. 2. A gas that is produced by fumes from cars and factories.
  3. 6. The second most important gas in air. Plants produce it.
  4. 7. A mixture of gases.
  5. 11. It travels through air.