Across
- 3. Smallest continent
- 5. Famous African river
- 6. Gas humans need to breathe
- 8. English playwright of Hamlet
- 12. Highest mountain above sea level
- 13. Largest ocean on Earth
- 14. Flightless bird of Antarctica
Down
- 1. Hardest natural mineral
- 2. Powerful tropical storm
- 4. Largest planet in the solar system
- 7. Physicist associated with relativity
- 9. Planet known for its rings
- 10. Mountain that erupts lava
- 11. Closest planet to the Sun
- 13. Ancient Egyptian monument