Chapter 7&8 Crossword

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Across
  1. 2. What is the warmest ocean ?
  2. 6. Was is the name of the small early planets, which formed through gravitational attraction reaching the sizes of a few miles to eventually the size of our moon?
  3. 7. What is the first largest ocean?
  4. 10. Why do stars twinkle?
  5. 12. What is the smallest ocean?
  6. 14. What are scientists able to calculate from the radioactive elements found in a meteorite that decay at a particular rate?
Down
  1. 1. When the Earth first formed(at midnight on our 24-hour clock of Earth's history), how was the Earth like?
  2. 3. What is the second largest ocean?
  3. 4. What type of object can give us information about the conditions in which the solid planets formed?
  4. 5. Earth's iron core creates a magnetic field which protects the planet from ?
  5. 8. What speacial kind of water do scientists look at in the ocean and in comets to see if the proportions match?
  6. 9. What name do scientist give to Earth when the outer surface was completely molten?
  7. 11. Was the moon closer or farther when the Earth was younger?
  8. 13. What planet is believed to have once had a magnetic field that disappeared when the planets iron core cooled?