Aaron's crossword puzzle

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Across
  1. 4. electricity generated by water
  2. 5. the smallest continent and country
  3. 7. the way people act and behave
  4. 10. a belief in a higher power or being
  5. 12. amount of years an average person is expected to live
  6. 13. referring to the countryside
  7. 14. goods purchased from other countries
  8. 16. executive leader of a presidential democracy
  9. 17. number of people in a certain area
  10. 18. A city or a town
Down
  1. 1. A dam that started construction in the 20th century
  2. 2. the average amount of money a person earns
  3. 3. a wall built in 1961 in Berlin
  4. 6. 0 degrees longitude
  5. 8. ruler with absolute power and authority
  6. 9. an exact location on Earth using latitude and longitude
  7. 11. goods sold to other countries
  8. 15. map a map that shows boundaries