Across
- 3. the type of planet Mercury is
- 5. mercury has the shortest orbital period around the sun
- 9. Roman name for the person this planet was named after
- 10. an activity that still occurs on Mercury as it cools
- 11. The line mercury rotates around
- 12. size relation of Mercury among the eight planets
- 13. this describes the weak atmosphere
- 14. the layer beneath Mercury's crust
- 15. The metal that makes up the core
Down
- 1. marks across the surface of Mercury
- 2. unlike earth, Mercury has none of these
- 4. distance relation to the sun among the 8 planets
- 6. what mercury has been doing for billions of years as it cools
- 7. describes mercurys core, mostly liquid
- 8. extreme temperature changes between day and night