Across
- 3. Equal to 88 Earth days
- 6. __________ planet to the sun
- 8. Journey around sun (fastest of any planet)
- 9. Nearest planetary neighbor
- 10. Mercury moon count
Down
- 1. Equal to 58 Earth days
- 2. Main surface feature
- 4. Member of inner __________ planets
- 5. Missing layer of protection
- 7. Core composition