Question

19. How does gravitation lead to formation of tides? Use a suitable diagram in support of your answer.
21. What happens when cold and warm ocean currents meet? How is it beneficial for the fishing
industry?
20. How do the ports of Alaska remain ice free in winter?
22. What is the impact of the North Atlantic Drift on climate?
23. Name three currents each driven by the northeast trades and the southeast trades.
24. What are deltaic forests? What kind of currents lead to their formation.
B. Answer these questions.
1. Explain four effects of tides,
2. Why do high tides occur every 12 hours 26 minutes?
3. Explain these terms: (a) apogean tide (b) tidal range (c) lunar day (d) salinity.
4. How does the Humboldt Current originate?
5. How does the Labrador Current create difficulties in navigation?
6. What are spring tides and neap tides?
7. What is the importance of tides?
8. State the importance of any three: (a) Gulf Stream, (b) North Atlantic Drift, (c) Labrador Current, (d)
Kuroshio and Oya Shio Currents
9. Distinguish between cold currents and warm currents. Give examples of each type.
10. Write short notes on: (a) spring tide, (b) neap tide, (c) Gulf Stream, (d) Labrador Current.
11. What are warm and cold currents? Give two examples each.
12. Write a note on the circulation in the Pacific Ocean. Represent the same on an outline map.
13. Write a note on the circulation in the Indian Ocean in summer and winter. Represent the same on
an outline map
14. Write a short note on perigean and apogean tides.
15. What is tidal amplitude?
16. What does quadrature lead to?
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Answer 1

Answer:

१...1) With the tide , fish move in to the Creek and this helps fishing activity . 2) The tide clear the waste and hence the coast become clean . 3) The tidel force can be generate electricity . 4) During tide , we can be stored sea water and can obtained a salt .