Across
- 1. Italian artist, architect, engineer of the renaissance, Leonardo _________
- 8. a combination of natural and synthetic materials
- 10. development of continuous manufacturing
- 11. development of stone tools
- 13. long life expectancy
- 16. hip replacement, knee replacement
- 17. invented materials that were previously non-existent
- 18. pipes, car parts, coins
- 19. comes from plant/animal group, minerals, metals
- 20. rubber bands, all plastic
Down
- 2. steel, stainless steel
- 3. our current time period: NOW
- 4. bomb invented in the information age
- 5. rebirth of the arts and humanities
- 6. discovery of copper
- 7. short life expectancy
- 9. defined by use of iron and steel
- 12. plastic, paste, liquid, gas
- 14. carbon-fiber bicycle
- 15. the time of the printing press