Invaders!

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Across
  1. 3. To be in charge of
  2. 4. To cover a wider area
  3. 5. To hold inside
  4. 8. To scientifically try something and view the results
  5. 10. To find out about something
  6. 12. The mold expert
  7. 16. What happens in a story
  8. 17. To rot, lose its essence
  9. 18. The department that cleaned up
Down
  1. 1. The principal
  2. 2. The science teacher
  3. 6. A plant growing where it is not wanted
  4. 7. The moisture in the air
  5. 9. The area where something lives
  6. 11. Who fainted in the story?
  7. 12. A furry growth on organic matter
  8. 13. The author grew up with these
  9. 14. What a plot is made up of
  10. 15. A mold seed