Reasons For The Seasons

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Across
  1. 2. north hemisphere Tropic
  2. 3. March________
  3. 5. Earth _______ around the
  4. 7. Tropical Z__e
  5. 10. Polar Z__e
  6. 11. direct______
  7. 16. polaris
  8. 17. Summer __________
  9. 18. indirect______
  10. 19. North star
Down
  1. 1. when the sun and moon meet its a ______
  2. 4. the hottest part of earth
  3. 5. Earth has a rev_______
  4. 6. temperate Z__e
  5. 8. santa doesn't live on the ?
  6. 9. earths_____
  7. 12. the earth spins on its ?
  8. 13. Santa lives on the ?
  9. 14. south hemisphere Tropic
  10. 15. Earth has a tilt