Across
- 3. Pioneer in radioactivity research
- 7. Proposed a Sun-centered solar system
- 9. Mathematician who shouted Eureka
- 10. Primatologist who studied chimpanzees
- 12. Most abundant element in Earth's crust
- 13. Pioneer of observational astronomy
- 15. Blue gemstone prized by royalty
- 19. Gas used in illuminated signs
- 20. Creator of the periodic table
- 21. Red gemstone associated with July
- 22. Developed the theory of relativity
- 23. Inventor whose name is now widely recognized
- 24. Green gemstone linked to May
- 25. Formulated the laws of motion
Down
- 1. Experimented with electricity and lightning
- 2. Author of A Brief History of Time
- 4. Hardest natural mineral
- 5. Element with the highest melting point
- 6. Precious metal denser than gold
- 8. Scientist behind pasteurization
- 11. Proposed evolution by natural selection
- 14. Purple variety of quartz
- 16. Natural light display near the poles
- 17. Most abundant element in the universe
- 18. Gas commonly used in balloons