Enigmatic

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Across
  1. 2. Ancient city of the Pharaohs, once the capital of Egypt
  2. 4. Inventor of the telephone
  3. 7. First woman to travel in space
  4. 10. Ancient city known for its Hanging Gardens
  5. 11. Element with the symbol ‘Hg’
  6. 12. Famous mathematician who invented calculus (last name)
  7. 14. Mathematical constant approximately equal to 3.14159
  8. 15. Longest river in the world
Down
  1. 1. Ancient Greek philosopher known for the theory of forms
  2. 3. Classical composer known for his "Symphony No. 9"
  3. 5. The capital of Japan
  4. 6. Actor who played the role of Harry Potter in the films
  5. 8. First artificial Earth satellite, launched in 1957
  6. 9. Author of 1984 and Animal Farm
  7. 13. Largest moon of Saturn