1. Which UK city is known as the 'Granite City'?

2. What is the chemical formula for table salt?

3. Who wrote the play 'Romeo and Juliet'?

4. In which US state is Mount Rushmore located?

5. What year did the Titanic sink?

6. Which British scientist discovered penicillin?

7. What is the smallest prime number?

8. Who painted 'Starry Night'?

9. Which continent is the Sahara Desert on?

10. What is the capital of Canada?

11. Which planet is known as the Red Planet?

12. Who was the first woman to fly solo across the Atlantic Ocean?

13. What is the main ingredient in guacamole?

14. Which UK monarch reigned the longest before Queen Elizabeth II?

15. What is the currency of Japan?

16. What year did the Berlin Wall fall?

17. Who is the author of the Harry Potter series?

18. What gas do plants absorb from the atmosphere?

19. Which US president issued the Emancipation Proclamation?

20. What is the hardest natural substance on Earth?