Ancient China Crossword puzzle

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Across
  1. 2. A ruler or "king" of china.
  2. 4. The continent where china is.
  3. 6. China's population.
  4. 7. Chinese people did this to harvest there plants.
  5. 9. The river of china that is also called the Huang he river.
  6. 10. Where most of Chinese people live.
Down
  1. 1. The defensive system that kept the barbarians to prevent invading the chinese.
  2. 3. The first emperor of china.
  3. 5. A period of time where there were a royal family that would have a certain roll as royalty.
  4. 8. The main food resource that the Chinese used.