Across
- 3. A mountain that can erupt with lava.
- 6. The highest mountain in the world.
- 7. The coldest continent on Earth.
- 10. A famous ancient structure found in Egypt.
- 11. The gas people need to breathe.
- 13. The planet famous for its rings.
- 14. The largest ocean in the world.
- 15. The hardest natural material on Earth.
Down
- 1. A very dry place with little rainfall.
- 2. An animal with six legs.
- 4. The tallest land animal.
- 5. The closest planet to the Sun.
- 8. A tool used to find directions.
- 9. A place where people borrow books.
- 10. A bird that cannot fly but can swim very well.
- 12. A colourful arc that appears after rain.