How is Earth's Population Changing?

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Across
  1. 4. areas inside cities
  2. 6. a number live briths
  3. 7. a max number of people
  4. 9. a study of human population
Down
  1. 1. brides flying south
  2. 2. a number of deaths
  3. 3. a system of good and services
  4. 5. areas outside cities
  5. 8. a group or type of people