Preserving the environment

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Across
  1. 3. (n)The lowest layer of air on a planet
  2. 5. (v)To maintain the state of sth
  3. 9. /diːˌfɒrɪˈsteɪʃ(ə)n/
  4. 12. /dɪˈpliːʃ(ə)n/
  5. 13. /ˈɪnfluənt(ə)l/
  6. 14. /pəˈluːtid/
  7. 16. (n)A chemical that counters smells
Down
  1. 1. /'strætə,sfɪə(r)/
  2. 2. /kəʊl/
  3. 4. /fɜː(r)təlaɪzə(r)/
  4. 6. (n)A system in which living organisms interact
  5. 7. (adj)To have a great effect on something
  6. 8. effect (n)A phenomenon related to farming
  7. 10. (n)A chemical used to exterminate harmful creatures
  8. 11. warming (n)The increase of Earth's Tempreture
  9. 15. (adj)To lack rain and plants