Title

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Across
  1. 4. 6th element
  2. 6. layer of gas
  3. 7. release of gas
  4. 8. Involving living organism
  5. 10. a form of transmission of energy
  6. 11. Slowly worn away
  7. 12. O3
Down
  1. 1. Outermost shell of earth
  2. 2. Breaking down of dead organisms
  3. 3. Type of rock
  4. 5. mixture of organic matter
  5. 9. Termination of a species