Earth and Mars

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Across
  1. 1. Mars is about _____ the size of Earth
  2. 3. Earth has a _________ field that protects us from solar radiation
  3. 7. Colorful light displays caused by solar wind reacting with Earth's magnetic field
  4. 9. Mars has the largest ________ in the solar system
  5. 11. Earth is the largest of the __________ planets
  6. 14. Earth is the only planet not named after __________
  7. 16. The word "Earth" comes from the germanic word for ________
  8. 17. Earth is the only planet that has _________ on its surface
Down
  1. 2. Earth's crust moves about the same rate as your __________ grow
  2. 4. The outermost layer of Earth is called the ________
  3. 5. On top of the inner core sits the ___________
  4. 6. Mars is named after the Roman god of _____
  5. 8. Mars is covered in ______ giving it a red appearance
  6. 10. Earth is the only planet that we know of that can sustain ________
  7. 12. Martian days are called _________
  8. 13. The layer of Earth in the very center is called the ________ core
  9. 15. Outside of the inner core is the __________ core