Across
- 1. The type of water scientists look for in comets and in the oceans to see if there proportions match
- 7. Political boundary that separates North and South America
- 10. United States, Mexico, and Canada
- 12. Believed to have once had a magnetic field that disappeared when its core cooled
- 14. The most common map used in classrooms
- 17. How quickly is the earth every year?
- 19. Surrounded by the Mediterranean Sea, Indian Ocean, and the Atlantic Ocean
- 21. Lines of Longitude
- 22. The center of this ocean is ice that is 10 feet deep
- 23. Smallest continent
- 24. Was the moon closer of farther when the Earth was younger
- 28. Name of the Earth when the outer surface was completely molten
- 29. Place where the primary reference line passes through
Down
- 2. Largest ocean in the world
- 3. Distorts the continents as little as possible
- 4. Earths iron core protects the earth from
- 5. second largest ocean
- 6. Its axis is tilted at 23 1/2 degrees
- 8. imaginary line running mostly along 180 degrees meridian
- 9. When the earth first formed, what was the earth like
- 11. Younger than the earth by millions of years
- 13. Lines of latitude
- 15. 1.85km is equal to
- 16. The continent of the South Pole
- 18. Distance measured by marine and air navigators
- 20. Earth is born
- 25. America Everything south of Panama
- 26. Color that can penetrate the ocean water the deepest
- 27. When the Earth was liquid rock, what element sank towards earths center
- 30. General shape of the earth