Marinelli's class word puzzle

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Across
  1. 2. our sideways planet where the rings go up and down
  2. 5. known for being Egypt's biggest stucture
  3. 7. our most BLUE planet
  4. 9. our galaxy name
  5. 10. known for being the oldest human time period
  6. 11. known for our livable planet
  7. 14. first ever civilisation of earth
  8. 16. known for being the place holding our 8 planets mercury Venus ect
  9. 17. one of marinelli's subjects
Down
  1. 1. known for largest planet in solar system
  2. 3. the person our social studies project is about
  3. 4. one of marinelli's subjects
  4. 6. known for one of ancient Chinese game involving 7 peices
  5. 8. known for turning into a dwarf planet
  6. 12. our most hot plane (also known as earths sister)
  7. 13. known for our planet trying to terraform
  8. 15. known for 2nd largest in solar system