Across
- 4. Period of rapid scientific and cultural progress in Europe
- 7. Chemical symbol for gold
- 8. UN agency for education, science, and culture
- 10. Prize awarded for major achievements in science and peace
- 11. Process plants use to convert light into energy
- 12. Inventor associated with alternating current
- 14. Book of maps
- 15. World’s largest hot desert
- 16. Naturalist who proposed evolution by natural selection
- 17. Unit of electrical resistance
- 19. Layer protecting Earth from ultraviolet radiation
- 20. Continent containing over 40 countries
- 21. The “Red Planet”
- 23. Branch of mathematics dealing with change
Down
- 1. Astronomer tried by the Inquisition
- 2. Basic SI unit of force
- 3. City that is the seat of government in most countries
- 5. Smallest unit of ordinary matter
- 6. Marie’s surname
- 9. Greek philosopher who taught Aristotle
- 13. Earth’s largest ocean
- 17. England’s oldest university
- 18. Study of earthquakes
- 22. Author of 1984