6th grade China puzzle

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Across
  1. 4. most popular trade route for China
  2. 6. major crop in China
  3. 9. a river in China
  4. 10. a river in China (a color)
  5. 12. measures strength of earthquake
  6. 13. first dynasty of China
Down
  1. 1. desert in China
  2. 2. a long,long wall in China
  3. 3. idea that heaven gave power to king
  4. 4. tells time by shadows
  5. 5. believed father was head of family
  6. 7. ocean to the east of China
  7. 8. taught that people bad by nature
  8. 11. religion that taught universe is balance of opposites