Rise to the Challenge: Overpopulation

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Across
  1. 1. Gases or smoke that are released into the air, usually from cars or factories
  2. 5. The best or most effective condition or level
  3. 7. When more people move to cities, and towns grow bigger
  4. 8. Areas in the countryside, away from cities or large towns
  5. 10. To move from one place to another, usually to live or work there
Down
  1. 2. The basic systems a city needs, like roads, schools, bridges, water, and electricity
  2. 3. To include or add something as part of a larger whole
  3. 4. Growing, successful, and doing well
  4. 6. Making goods or products in factories using machines
  5. 9. People who live in a particular place (for example, city dwellers = people who live in cities)