1. Why is it famously easy for humans to float in the Dead Sea?

2. Which major engineering feat is located on the Yangtze River?

3. What significant paleontological discovery was first made in the Gobi Desert in the 1920s?

4. Which of the following makes the Sargasso Sea unique compared to all other seas?

5. Which river is the longest tributary of the Mississippi River?

6. K2, the second-highest peak in the world, is part of which mountain range?

7. The Volga River empties into which body of water?

8. The Ganges River forms the world's largest delta before entering the Bay of Bengal. What is it called?

9. The North Sea is a major global producer of which two natural resources?

10. How do the Appalachian Mountains compare in age to the Himalayan Mountains?

11. What unique human characteristic distinguishes the Thar Desert from other major world deserts?

12. What gives the massive dunes of the Namib Sand Sea their distinctive red color?

13. What is the highest peak in the Atlas Mountains?

14. What is the highest mountain in the Great Dividing Range and on mainland Australia?

15. The Mekong Delta, a major rice-producing region, is located in which country?

16. Why is it famously easy for people to float in the Dead Sea?

17. By what other name does South Korea refer to the Sea of Japan?

18. Which cold ocean current is responsible for the fog that sustains life in the Namib Desert?

19. What is the name of the world's largest continuous sand desert located within the Arabian Desert?

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