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Across 4. The spread of ideas from one culture to another 8. A barrier to stop invaders (s.3) 10. A device that uses the position of shadows to tell time 12. invented in 105 AD that eventually replaced papyrus for writing on (s.4) 16. The practice of using fine needles to cure disease or relieve pain (s.4) 18. A new idea, method, or device 19. A person with a small farm 20. a system of beliefs and values

Down 1. A hard gemstone popularly used for carving (s.4) 2. A 4,000-mile-long trade route (s.4) 3. The belief that people were bad by nature 5. A device that measures the strength of an earthquake (s.4) 6. A person of high rank 7. a local leader of armed groups 9. A single-wheeled cart (s.4) 11. The Qin king who unified China (s.3) 13. The most influential teacher in Chinese history(s.2) 14. a kind of money 15. a fine yellow soil 17. A soft, light, highly valued fabric (s.4)