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प्रश्न
What are the causes of currents?
उत्तर
Ocean currents are like river flow in oceans. They are caused by two types of forces namely:
- Primary forces that initiate the movement of water;
- Secondary forces that influence the currents to flow.
Primary Forces: The primary forces that influence the currents are:
- Heating by solar energy: Heating by solar energy causes the water to expand. That is why, near the equator the ocean water is about 8 cm higher in level than in the middle latitudes. This causes a very slight gradient and water tends to flow down the slope.
- Wind: Wind blowing on the surface of the ocean pushes the water to move. Friction between the wind and the water surface affects the movement of the water body in its course.
- Gravity: Gravity tends to pull the water down the pile and create gradient variation.
- Coriolis force: The Coriolis force intervenes and causes the water to move to the right in the northern hemisphere and to the left in the southern hemisphere. These large accumulations of water and the flow around them are called Gyres. These produce large circular currents in all the ocean basins.
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संबंधित प्रश्न
In which ocean does the Labrador current flow?
Which of these following currents flows from the northern polar region upto Antarctica?
Explain the effect of meeting of warm and cold ocean currents.
Explain the effect of the transportational capacity of ocean currents.
Name the three ways in which the movement of ocean water takes place.
Name two types of ocean currents based on their temperature.
What happens when warm and cold currents meet?
What is meant by the ‘salinity’ of ocean water?
Give reasons for the following:
The eastern coasts of the USA are comparatively cold.
Give reasons for the following:
The waters of the Oyashio Current form the richest fishing grounds in the world.
Give reasons for the following:
The coasts of Norway are not frozen in winter whereas its adjoining coasts are frozen for most parts of the year.
Give reasons for the following:
Rich fishing grounds are located on the Pacific coast of North America.
Describing the types of ocean currents, state, and factors responsible for causing the currents.
Describe the circulation pattern of the following ocean current.
Labrador Current of the Atlantic Ocean.
Describe the circulation pattern of the following ocean current.
The Kuroshio current
Describe the circulation pattern of the following ocean current.
Oyashio Current of the Pacific Ocean.
Describe four major effects of currents.
Answer the following question:
What are ocean currents?
Very Short Answer Type Question:
Name one warm current and one cold current.
Long Answer Type Question:
Give an account of ocean currents.
How does currents affect the temperature of coastal areas in the N. W. Europe?
