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Across
  1. 4. means a hollow space
  2. 8. an energy source
  3. 9. people with no weapons
  4. 11. cutting down trees
  5. 13. meaning control others
  6. 14. elogical communities
  7. 16. species and environments
  8. 18. another word for carefully
  9. 19. another word for taking a trip
  10. 20. opposite of useless
Down
  1. 1. opposite of not bothered
  2. 2. means gases around the universe
  3. 3. a plan
  4. 5. what affects our lives
  5. 6. means capable of decaying
  6. 7. another word for entertainment
  7. 10. another word for substitute
  8. 12. meaning extremely well
  9. 15. another word for journey
  10. 17. means office workers