Across
- 5. all of the Earth's water
- 7. object in orbit around body with larger mass
- 9. December 21 or 22
- 12. a mission to the moon in 1969
- 13. a Yugoslavian scientist
- 15. Earth is closest to the Sun
- 18. imaginary line that connects North and South pole
- 20. solid portion of mantle and crust
- 22. measures the height and shape of land
- 23. solid outer most layer covering the Earth
- 27. June 21 or 22
- 29. force of attraction between all objects
- 30. boundary between the crust and the mantle
- 31. bay in California
- 32. measure of the strength of the pull of gravity
- 33. satellite that is farthest from Earth
- 35. March 20 or 21
- 37. orbit over the North and South pole with each pass
- 38. "biological clock"
- 41. location where the day begins
Down
- 1. wobbling motion of the Earth
- 2. thick blanket of gases
- 3. orbit stay over same point above equator
- 4. movement of the Earth around the Sun
- 6. Denver-based geologist
- 7. no P or S waves
- 8. satellite that is closet from the Earth
- 10. region affected by Earth's magnetic field
- 11. center of the earth
- 13. the amount of matter in an object
- 14. developed the law of gravitation
- 15. ability for a solid to flow
- 16. shape of the Earth
- 17. "about" Latin
- 19. vibrations that travel through the Earth
- 21. moving forward to extend light at night
- 24. mapped unknown features of ocean floor
- 25. study of origin of Earth's surface features
- 26. two-thirds of Earth's mass
- 28. "equal night"
- 34. network of navigational satellites in polar orbit
- 36. designed to carry cargo, orbit and return
- 39. Earth is farthest from the Sun
- 40. spinning motion of the Earth