Chapter 7 & 8 Crossword

6. The galaxy earth belongs to.
7. The year the UN established major boundaries.
10. Theory of how stars and planets were formed.
12. The prime meridian runs through this place(not the city).
13. The process the planets formed through.
14. Located at 180 degrees longitude.
15. Why stars twinkle.
21. Huge rotating aggregation of stars, dust, and gas held together by gravity.
22. One nautical mile per hour.
23. The release of volatile substances and water vapor.
25. What stars are made of.
26. 5.5 percent of ice coverage.
27. A line of latitude.
29. Map with most accurate representation of the features of the earth.
30. There are 60 of these in one degree.

1. The warmest ocean, also used as a trade route between Africa and Asia.
2. What a star becomes when it runs out of helium and swells up
3. The time it took for the ocean to form
4. Map most commonly seen in classrooms, have become extremely accurate due to technology.
5. A cloud of cold dust and gas in a galaxy.
7. The width of a time zone.
8. Map that distorts continents as little as possible by not slicing into them.
9. Name of the city the prime meridian runs through.
11. Its southern border marks the boundary between North and South America.
16. The smallest and coldest ocean.
17. continent of the south pole.
18. A map maker.
19. When a star's core collapses in an explosion.
20. Ocean that covers 30.5 percent of earth.
24. Occurred 15 billion years ago.
28. Ocean that connects the polar waters.