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1. How many troughs are discovered in atlantic ocean?

2. How many troughs are found in Indian ocean?

3. What forms by range of mountain separated by great depression

4. What could be the peak of the mid-oceanic mountain ridge?

5. What is the example of mid-oceanic mountain located in the mid-atlantic ridge?

6. Which of the following is the steepest peak mountain?

7. How are sea mounds formed among the following?

8. What is the height of sea mounds?

9. Which of the following is an example of an extension of the hawaiian islands into the pacific ocean?

10. Which of the following is the well-known canyon in the universe?

11. Which of the following oceans has more than ten thousand sea dunes and submerged islands?

12. Which of the following causes an increase in temperature between the east coast of america and the west coast of europe?

13. Which of the following is a labrador?

14. What is called when there is a sudden drop in temperature among the following?

15. For which of the following is the word salinity used?

16. Which of the following is the salinity of normal sea?

17. Which of the following is the percentage of salinity in the red sea?

18. Which of the following is not a part of the aquatic cycle?

19. What is the average continental depth?