Q1. Fill in the blanks.
i. Generally the warm ocean currents originate near __________.
ii. The ocean bodies and the seas contain ___________water.
iii. The average salinity of the oceans is _____ parts per thousand.
iv. ______________salt is mostly dissolved in ocean and sea water.
v. __________are formed when winds scrape across the ocean surface.
i. When air is heated, it expands, becomes lighter and goes up. _______
ii. Three-fourth of the earth surface is covered by water. ________
iii. The low tides also help in fishing. ________
iv. High tides help in navigation. ________
Q3. Which is the largest lake in the world?
Q4. What is a terrarium?
Q5. What is meant by the term salinity?
Q6. What is the salinity of Dead Sea?
Q7. How is it possible to float in the Dead Sea?
Q8. Why is the ocean salty?
Q9. What is the effect of high tide?
Q10. What is the effect of low tide?
Q11. What are the major sources of freshwater?
Q12. When is world water day celebrated?
Q13. What is the first indication of a tsunami?
Q14. Why is water essential for our survival?
Q15. What happened to the Indira point during the tsunami of 2004?
Q16. Name one warm ocean current and one cold ocean current?
Q17. What is Tsunami?
Q18. What are ocean currents?
Q19. Where does the word tsunami come from and what does it mean?