Across
- 5. What is the primary reference line of latitude?
- 6. Ocean What ocean is the trade route between Africa & Asia?
- 8. What percentage of ice covers the total surface of earth?
- 9. When was Stanley millers experiment?
- 15. Lines of latitude are also known as _____
- 17. ____ of the oceans is covered in ice?
- 18. Water collected in ____ when the surface of the earth cooled
- 20. The continent of the south pole is ___?
- 22. Ocean What name do scientists give to earth when the outer surface was completely molten?
- 23. England What place does the primary reference line of longitude pass through?
- 24. How many major continental land areas are there?
Down
- 1. in How quickly is the moon moving away from the earth?
- 2. billion years How long ago were there at least islands of continental crust on earth?
- 3. The united nations established the boundaries of the oceans and continents when?
- 4. Which ocean connects the polar waters?
- 5. Hubble Who made the discovery that distant stars and galaxies are receding from the earth in all directions?
- 7. What is the smallest ocean?
- 10. What general shape does the earth have?
- 11. (Release of volatile substances and water vapor) occurred everywhere and caused massive clouds in upper atmosphere.
- 12. ____ of the land is covered In ice?
- 13. The earth is divided into time zones that are ____ degrees wide
- 14. What color can penetrate the ocean waters the deepest?
- 15. What is the largest ocean?
- 16. The ____ is a typical star?
- 19. Winds Earth’s iron core creates a magnetic field which protects a planet from?
- 20. What are scientists able to calculate from the radioactive elements found in a meterorite that decay at a particular time?
- 21. What planet is believed to have once has a magnetic field that disappeared when the planet iron core cooled?