Across
- 2. Essential element for breathing
- 3. Superhero from Gotham City
- 5. Second planet from the Sun
- 7. Long-distance running race
- 11. Japanese dish with raw fish
- 13. Gem formed inside an oyster
- 15. Stringed musical instrument
- 17. Famous mausoleum in India
- 18. Renowned theoretical physicist
Down
- 1. Iconic clock tower in London
- 4. Second largest ocean
- 6. Famous English playwright
- 8. Fictional wizard with a lightning scar
- 9. Longest river in the world
- 10. Electric car manufacturer
- 12. Ancient practice for physical and mental well-being
- 13. Ancient Egyptian tomb structure
- 14. Popular programming language
- 16. Largest rainforest in the world
- 19. Tallest mountain in the world