Chapter 7 & 8 Crossword

4. What a star becomes when it runs out of helium and swells up
5. Ocean that connects the polar waters.
7. The release of volatile substances and water vapor.
10. The galaxy earth belongs to.
13. A map maker.
15. There are 60 of these in one degree.
16. Huge rotating aggregation of stars, dust, and gas held together by gravity.
17. Located at 180 degrees longitude.
18. Map with most accurate representation of the features of the earth.
19. The process the planets formed through.
22. The width of a time zone.
26. Theory of how stars and planets were formed.
27. Map most commonly seen in classrooms, have become extremely accurate due to technology.
30. A cloud of cold dust and gas in a galaxy.

1. One nautical mile per hour.
2. 5.5 percent of ice coverage.
3. A line of latitude.
6. continent of the south pole.
8. What stars are made of.
9. The prime meridian runs through this place(not the city).
11. Why stars twinkle.
12. Occurred 15 billion years ago.
14. The time it took for the ocean to form
20. Name of the city the prime meridian runs through.
21. Map that distorts continents as little as possible by not slicing into them.
22. The year the UN established major boundaries.
23. When a star's core collapses in an explosion.
24. Ocean that covers 30.5 percent of earth.
25. The smallest and coldest ocean.
28. Its southern border marks the boundary between North and South America.
29. The warmest ocean, also used as a trade route between Africa and Asia.