Across
- 3. to light a fire (577AD)
- 7. burn for fuel and light
- 8. steel-making process
- 10. used in horseback riding (3 AD)
- 11. used to make cast iron (4th BCE)
- 14. mother of Chinese invention
- 15. water transportation
- 17. one of the four ancient inventions
Down
- 1. money, not easily faked
- 2. instead of a fraction (14th BCE)
- 4. of navigational importance
- 5. wheelbarrow inventor
- 6. China has always been at the forefront of scientific developments
- 9. evidence of ancient astronomy
- 12. most ancient industrial plastic
- 13. China boasts of
- 16. first mechanical clock was built by a ___