continents and time

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Across
  1. 2. AD
  2. 3. the time it takes for the earth to revolve around the sun
  3. 7. an imaginary line that splits the world in half
  4. 10. a political organization of land and people
  5. 11. a large landmass mostly surrounded by water
  6. 14. half the globe
  7. 15. the largest continent
  8. 16. the northern most ocean
Down
  1. 1. BC
  2. 2. this is a continent and a country
  3. 4. this year does not exist
  4. 5. CE
  5. 6. BCE
  6. 8. America the continent we live on
  7. 9. the largest ocean
  8. 12. a unit of ten years
  9. 13. a unit of 100 years