Alien Invaders

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Across
  1. 4. containing poison that is dangerous
  2. 6. to let go of something
  3. 8. weather conditions
  4. 10. surroundings or habitat
  5. 12. to be likely to destroy something
Down
  1. 1. originally from an area
  2. 2. to get in a situation where you are not wanted or needed
  3. 3. to grow in number rapidly
  4. 4. an event of scientific interest
  5. 5. able to do something
  6. 7. to move into a place and cause harm
  7. 9. tracking or following something.
  8. 11. a way of doing something
  9. 13. to change in some way