graph /y/ making 'i'

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Across
  1. 3. Made by people not grown in nature
  2. 4. Country famous for pharaohs and the Nile
  3. 9. The gas we breathe to stay alive
  4. 12. Where you do PE and play on equipment
  5. 13. Filled with oxygen like fresh air or blood
  6. 17. A mysterious clue or message
  7. 18. When two sides match or look the same
Down
  1. 1. Old stories about gods heroes and monsters
  2. 2. What usually happens normal
  3. 5. Sport with flips balances and tumbling
  4. 6. Huge triangle shaped building in Egypt
  5. 7. A picture or sign that stands for something
  6. 8. A shape like a can or a tube
  7. 10. Being kind and understanding to others
  8. 11. Words of a song
  9. 14. Feelings of care for someone who is sad
  10. 15. The science of forces motion and energy
  11. 16. A word that means the same as another word