Answer the following questions in brief :
1. Name three types of movements in ocean waters.
2. What causes waves ?
3. What is the cause of the tides?
4. How are tides useful?
5. Define ocean current.
6. Name the warm ocean currents modifying the climate of USA and Japan.
7. Name the cold currents which are partially responsible for the desert climate of the Atacama and the
Kalahari deserts.
8. Name any one factor which is responsible for the occurrence of ocean current ?
9. Why the north-eastern coast of Japan is one of the most important fishing grounds of the world?
10. What are tsunami waves ? How are they caused ?
11. Describe the impact of currents on fishing and navigation.
Answers
•Name three types of movement in ocean waters
-waves
-tide
-ocean currents
•What causes waves
-waves are created by the friction between wind and surface water. As wind blows across the surface of the ocean or a lake, the continual disturbance creates a wave crest.
•What is the cause of the tides
-Gravity is one major force that creates tides. In 1687, Sir Isaac Newton explained that ocean tides result from the gravitational attraction of the sun and moon on the oceans of the earth
•how are tides useful
-Tides affect other aspects of oceanic life, including the reproductive activities of fish and ocean plants.
•Defined ocean current
-ocean current is a continuous, directed movement of sea water generated by a number of forces acting upon the water, including wind, the Coriolis effect, breaking waves, cabbeling, and temperature and salinity differences
•Name the warm ocean currents modifying the climate of USA and Japan.
-Similar to the Gulf Stream (Atlantic) in its creation and flow patterns, the Kuroshio has an important warming effect upon the south and southeast coastal regions of Japan as far north as Tokyo.
Answer:
1. waves
tide
ocean currents
2. the pushing action of the wind cause waves.
3.tides are caused by the force of attraction of moon and sun and rotation of earth.
4. ★navigation
★ prevention of selling of harbours
★ generation of electricity
★importance for fishermans
5. large scale movement of water in the oceans in definate direction are called ocean currents.
6. gulf stream modify the climate of USA . Kurushio current modifies the climate of Japan.
8. difference in temperature and salinity.
10.tsunami disaster waves of the hi MP tute which are caused by the earthquake or any sudden displacement of sea floor.
11. ★impact of fishing: helps in the production of planktons. planktons are the main mint organisms which provide food for the fish. hence, they have support fish in large number.
★impact on navigation : produce very thick fog over the area, this is very dangerous for the ship as visibility.
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