Across
- 1. Largest ocean
- 4. Hardest naturally occurring mineral
- 7. Board game with kings and queens
- 9. Government in which citizens vote
- 10. Official money of a country
- 12. Largest hot desert
- 13. Gas humans breathe
- 14. Instrument used to find direction
- 16. Scientist who formulated the laws of motion
- 18. Closest planet to the Sun
- 19. Highest mountain on Earth
- 20. Process plants use to make food
- 22. Planet famous for its rings
- 24. Largest planet in the Solar System
- 26. International multi-sport event
- 27. White marble monument in India
- 28. Scientist known for the theory of relativity
Down
- 2. Smallest unit of an element
- 3. System for organizing days and months
- 4. Molecule carrying genetic information
- 5. Classical composer from Austria
- 6. Imaginary line dividing Earth into two hemispheres
- 8. English playwright who wrote Hamlet
- 11. Arc of colors formed by sunlight and rain
- 14. Famous ancient amphitheater in Rome
- 15. Ancient Egyptian structure
- 17. Force that attracts objects toward Earth
- 21. Powerful tropical storm
- 23. One of the world's longest rivers
- 25. Mountain that erupts lava