Across
- 1. Largest moon of Saturn
- 3. Input device for typing
- 4. Formerly classified as the ninth planet
- 5. Planet with prominent rings
- 8. Essential gas for breathing
- 10. Second planet from the sun
Down
- 2. Mythical lost city
- 6. Natural light display in polar regions
- 7. Longest river in the world
- 9. Historic fortification in China