sustain te earth !!!!!!!!!

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Across
  1. 4. its the opposite of the start
  2. 6. woah thats a long word PLANTS + FOOD
  3. 7. cool costal thingy
  4. 9. same as last clue
  5. 10. clue do from start to end
  6. 12. to save
  7. 15. supply
  8. 17. reuse
  9. 18. 4
Down
  1. 1. longest word u can't even spell LOL
  2. 2. repeats
  3. 3. c'mon grass
  4. 5. c'mon do it from the start
  5. 8. organisms + enviroment
  6. 11. ANimas need homes
  7. 13. oxygen
  8. 14. yummy
  9. 16. wind! WATER! NATURE!!!