Broaden the Brain

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Across
  1. 2. Ancient city buried by Mount Vesuvius in 79 AD (7)
  2. 4. The freezing point of water in Celsius (5, 7)
  3. 5. A Shakespeare play about two star-crossed lovers (6, 3, 7 letters)
  4. 7. The part of the brain that controls memory and learning (9)
  5. 10. The process by which cells divide to create identical copies (7 letters)
  6. 13. Chemical element with the symbol ‘Au’ (4 letters)
  7. 14. Language in which the Taj Mahal inscriptions are written (5)
  8. 16. A sport played with a racket and shuttlecock (10 letters)
  9. 18. Popular book series featuring Katniss Everdeen (10, 7)
  10. 20. Force that opposes motion between two surfaces (8)
  11. 23. The number of strings on a standard violin (4)
  12. 25. The branch of science that studies weather (11)
  13. 26. Country with the largest coastline in the world (6)
  14. 27. The phase of matter that has a definite volume but no definite shape (6)
  15. 28. Park World War II code-breaking site in England (8, 4)
Down
  1. 1. Capital of Iceland (8)
  2. 3. A Japanese art of paper folding (7)
  3. 6. A Greek hero whose only weakness was his heel (8)
  4. 8. Document signed in 1215 limiting the power of the English king (5, 5)
  5. 9. The powerhouse of the cell (13 letters)
  6. 11. Country with the most time zones (6)
  7. 12. Greek hero of the Trojan War (5 letters)
  8. 15. The human body system responsible for breaking down food (9)
  9. 17. The official language of Brazil (9)
  10. 19. Gas making up about 78% of Earth's atmosphere (8)
  11. 21. The treaty that ended World War I (6, 9)
  12. 22. Explorer who first circumnavigated the globe (7)
  13. 24. Mythical bird that rises from its ashes (7 letters)