Across
- 2. period of time needed for complete one orbit
- 3. process of loosen or break down of rock
- 4. the smallest planet on our solar system
- 6. growing this will prevent soil erosion from happening
- 9. the shape of orbit
- 10. the biggest planet in our solar system
- 12. without gravitational force planet will move in ... line
- 13. removal of soil by wind and rain
- 16. mixture of decayed plant, animal, rocks
Down
- 1. when moon block part of sunlight
- 5. sound cannot travel through
- 7. earth is tilted by its ..
- 8. sound can travel in all
- 11. caused by moon gravity
- 14. the result of titled earth
- 15. sound travel fastest in this medium