Across
- 3. plants and animals evolve from past generations
- 9. allowed steel to be produced
- 11. biggest transportation invention ever
- 15. increased availability of cotton
- 16. revolutionized railroad tunnel building
Down
- 1. allowed power to be stored
- 2. invented idea of disassembly plants
- 4. first plow with replaceable parts
- 5. spiral groove gun with more accurate shot
- 6. broke trench warfare stalemate
- 7. helped communication during Great War
- 8. 500 rounds/min adopted by British army
- 10. created first vaccine
- 12. laws of gravity
- 13. communication using morse code
- 14. Engine basis of every engine today