Criss-Cross Puzzle

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Across
  1. 3. A gas essential for combustion
  2. 6. A chemical process of burning
  3. 7. The tendency of a substance to undergo chemical reactions
  4. 9. Able to decompose naturally and return to the environment
Down
  1. 1. Does not break down naturally in the environment
  2. 2. The ability to catch fire easily
  3. 4. These creatures help break down organic matter in the soil
  4. 5. Highly reactive and prone to catching fire
  5. 8. Fungi that aid in the decomposition of organic material
  6. 10. The corrosion of iron or steel due to chemical reactions
  7. 11. The natural breakdown of organic matter over time