Across
- 3. Rocky and dense
- 6. When something is moving around another object
- 7. To spin on an axis
- 8. When the Moon, Sun and Earth are perfectly alined
- 9. Gaseous and less dense
- 11. The study of ancient artifacts
- 13. The Moon orbits the Earth about once every 29.5 days
- 14. The kind of rock that layers are made out of
- 15. The remains of organisms in preserved in rock
- 16. Divides the inner and outer planets
Down
- 1. When the moon is fully lit up
- 2. Who found out gravity
- 4. The youngest on the top and the oldest on the bottom
- 5. The Moon passes between the Earth and sun, blocking sunlight
- 8. Earth goes around the Sun once every 365 days
- 10. Tilted about 23.5 degrees
- 12. Holds planets in an orbit around the sun