1. What is the capital city of Mexico?

2. What sea separates Europe and Africa?

3. What is the capital city of Germany?

4. The Rhine River empties into which body of water?

5. Which famous meteorite impact crater is located in the Great Sandy Desert?

6. What term describes the Baltic Sea's unique mixture of fresh and salt water?

7. The Ural Mountains are considered the primary boundary between which two continents?

8. Why is the Huang He frequently referred to as the 'Yellow River'?

9. The Patagonian Desert is primarily a result of the 'rain shadow' effect caused by which mountain range?

10. What is the Rio Grande called in Mexico?

11. Which famous 'floating city' is located at the northern tip of the Adriatic Sea?

12. The Dnieper River empties into which body of water?

13. In which country does the Brahmaputra River originate?

14. The Great Barrier Reef is located within which sea?

15. The Saint Lawrence River flows from which of the Great Lakes?

16. Victoria Falls is located on the border between which two countries?

17. Which strait connects the Black Sea to the Sea of Marmara?

18. The Volga River empties into which landlocked body of water?

19. Which iconic plant species is used as an indicator to define the boundaries of the Mojave Desert?

20. The Mediterranean Sea is a remnant of which ancient ocean?