Chapter 8
Across
- 7. Another name for latitude
- 10. The early atmosphere contained ammonia, carbon dioxide, water vapor, other gasses, and also this
- 11. Bordered by the Atlantic Ocean to the west, the Indian Ocean to the east, and the Mediterranean sea to the North
- 14. Includes the United States, Mexico,& Canada
- 16. What makes a star shine
- 17. The Big Bang is thought to have occurred this many years ago
- 19. Iron sinking to the middle of a planet and lighter minerals migrate to the surface forming the crust
- 21. Largest ocean
- 22. The primary reference line for latitude
- 24. Heavy rains fell for this many years
- 25. This made heavy rains fall
- 26. A super nova exploding
- 30. Our galaxy
- 31. Something that continues to this day
- 33. Stars are massive spheres of this
- 36. The event that caused it to rain on Earth
- 37. Continent of the south pole
- 38. This formed around 4.6 billion years ago
- 39. The political boundary that separates North and South America
Down
- 1. The Elements most abundant after the Big Bang
- 2. The universe’s beginning
- 3. Single continuous land mass that includes Europe and Asia
- 4. A collapsing star
- 5. The last stage of evolution of a star before a super nova
- 6. Protects us from UV rays
- 8. The accretion period lasted this many million years
- 9. Includes all countries south of panama
- 12. The first type of organism on Earth
- 13. The primary reference line for longitude
- 15. How stars and planets were formed
- 18. 10% of the earth is covered with this
- 20. Second largest ocean
- 23. the color that penetrates ocean water the deepest
- 27. The reason water is liquid on Earth
- 28. The origin of life on earth came from here
- 29. Provides tides in the ocean
- 32. Everything is made up of this
- 34. Smallest major land mass
- 35. General shape of the Earth