human systems

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Across
  1. 3. life length
  2. 5. family members
  3. 9. speed of change
  4. 11. moving of people
  5. 12. rate of kids
  6. 13. exposed stuff
  7. 15. an unchanging event
  8. 17. exported things
  9. 18. lower
Down
  1. 1. people choosing to move
  2. 2. moving stuff
  3. 4. higher
  4. 6. going down
  5. 7. needing other countrys
  6. 8. getting bigger
  7. 10. equal trading
  8. 11. imported stuff
  9. 14. not by choice
  10. 15. trading stuff
  11. 16. the same