Alien Invaders

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