Across
- 2. A chemical element with the symbol "Fe"
- 5. A celestial body that orbits the sun and has a tail when close to the sun
- 7. The biggest mountain in the solar system
- 8. Notable Roman general known for his crossing of the Alps
- 11. The largest ocean on Earth
- 12. The process by which plants make their own food
- 14. The second-largest planet in our solar system
- 15. The outer layer of the Earth
- 18. Famous physicist who developed the theory of relativity
Down
- 1. The capital city of Australia
- 3. Who made Apple?
- 4. Leader in USSR
- 6. The study of the origin and development of the universe
- 9. A large, venomous snake found in South America
- 10. The most popular game in the world
- 13. The smallest prime number
- 16. Author of "1984" and "Animal Farm"
- 17. How much planets we have in solar system