INVADERS! Aliens From Earth

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Across
  1. 2. to be in charge of something
  2. 6. see or meet for the first time
  3. 7. damp, the moisture in the air
  4. 9. to cover a wider area
  5. 10. where something lives
  6. 12. how many people or animals live in an area
  7. 15. to rot
  8. 18. to live there naturally
  9. 19. a contest
Down
  1. 1. steady
  2. 3. something happens that might kill them
  3. 4. when animals or people move from place to place
  4. 5. fuzzy growth on food
  5. 6. find out more about something
  6. 8. to take over
  7. 11. to test something and then come to a conclusion
  8. 13. mold and fungus seeds
  9. 14. special group of animals
  10. 16. to hold inside
  11. 17. the place in which an animal or plant lives