Science Crossword puzzle

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Across
  1. 7. The word that describes the earths revolution around the sun
  2. 8. The special latitude at 23.5 N degrees
  3. 9. The axis is always facing the ____
  4. 10. The zone between 23.5 degrees and 0 degrees
  5. 11. The earth's _______ around the sun
  6. 13. An oval/slash curve
  7. 14. The day where the daylight hours and night hours are equal around the world
  8. 15. The reason the hemispheres get different amounts of sunlight
  9. 17. The zone between 23.5 degrees and 66.5 degrees
  10. 19. An invisible line that goes through the earth
  11. 20. The longest and shortest days
Down
  1. 1. The north star
  2. 2. The most north point
  3. 3. The most south point
  4. 4. The sunlight during winter
  5. 5. The zone near Antarctica and the Artic
  6. 6. The sunlight during summer
  7. 12. A line that wraps around the earth going east and west
  8. 16. The special latitude at 23.5 S degrees
  9. 18. The cause of the day and night cycle