Across
- 4. force of attraction that exists between all objects in the Universe
- 5. ability for a solid to flow
- 7. a mission to the moon in 1969
- 8. location where a day begins
- 11. network of American satellites in a polar orbit
- 12. a Yugoslavian scientist
- 13. boundary between the crust and the mantle
- 14. March 20 or 21
- 16. movement of the Earth around the Sun
- 20. "about" Latin
- 21. two-thirds of Earth's mass
- 24. measures the height and shape of the land
- 26. "biological clock"
- 27. Denver-based geologist
- 29. satellite that is the farthest from the Earth
- 30. the amount of matter in a an object
- 31. an imaginary line that connects North and South poles
- 32. Earth is closest to the Sun
- 33. Earth is the farthest from the Sun
- 34. develeloped the law of gravitation
- 35. technician that develops instruments for earth scientists
- 38. center of the Earth
- 39. vibrations that travel through the Earth
- 41. orbit staying over the same point above the equator
Down
- 1. atmosphere affected by Earth's magnetic field
- 2. December 21 or 22
- 3. the study of origin of Earth's surface features
- 6. any object in orbit around another body with a larger mass
- 9. solid portion of mantle and the crust
- 10. wobbling motion of the Earth
- 15. a thick blanket of gases
- 17. satillites closest to the Earth
- 18. orbit over the North and South pole with each pass
- 19. all of the Earth's water
- 20. solid outer most layer covering the Earth
- 22. measure of the strength of the pull of gravity
- 23. moving clock forward an hour
- 24. no P or S waves
- 25. shape of the Earth
- 28. "equal night"
- 36. June 21 or June 22
- 37. launched in 1978 and mapped unknown features of ocean floor
- 40. spinning motion of the Earth