Earth Crossword Puzzle

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Across
  1. 4. When day and night are the same length after summer
  2. 5. When the Earth "wobbles"
  3. 8. 1 full year passes
  4. 9. 4 minutes earlier than a full day
  5. 10. Invisible line from the top and bottom of the Earth
  6. 12. The outermost layer of the Earth
  7. 14. When day and night are the same length before summer
  8. 15. Day when the Earth is furthest from the Sun
Down
  1. 1. Day when the Earth is closest to the Sun
  2. 2. Furthest point to the Sun from the Earth
  3. 3. The layer between the crust and the core
  4. 5. Closest point to the Sun from the Earth
  5. 6. Invisible line across the middle of the Earth
  6. 7. The motion of planets around the Sun
  7. 11. A full 24-hour day
  8. 13. The dense and hot sphere at the center of a planet