Ancient China Crossword puzzle

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Across
  1. 4. Natural barrier and a mountain range with the tallest mountain in the world
  2. 5. Valued greatly in China
  3. 8. longest river in Asia
  4. 9. Trade routes used to trade between china and western asian countries
  5. 11. Used as an explanation for why emperors ruled
  6. 12. fertile soil used for agriculture in chain
  7. 14. Natural barrier and 6th largest desert
  8. 15. What priests used to answer questions they had for the gods
Down
  1. 1. Mathematician and engineer Yu made it possible in China
  2. 2. includes farming and is very important in China
  3. 3. the world's second-largest shifting sand desert,
  4. 5. Nobility held lands from the Emporor in exchange for military service,and loyalty
  5. 6. What the Chinese people called China
  6. 7. line of rulers from the same family
  7. 10. Soilders made from clay uniquely
  8. 13. Started Chinese civilization