Across
- 3. A day based on the motion of stars
- 4. When a planet goes around its star
- 7. Discontinuity between the crust and mantle
- 10. A gas layer surrounding planets
- 12. The velocity required to escape a planet's gravity
- 15. The tilt of a planet
- 16. Layers separating by density
Down
- 1. When a planet wobbles on it's axis
- 2. When day and night are equal in spring
- 5. A day based on movement of the sun in the sky
- 6. What stops Earth from being fried by Solar rays?
- 8. When a planet is closest from it's star
- 9. When a planet is furthest from it's star
- 11. The path planets take around stars
- 13. The innermost layer of the Earth
- 14. A layer containing part of the crust and part of the mantle