Advertisements
Advertisements
प्रश्न
What are the causes of currents?
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
In which ocean does the Labrador current flow?
Which current out of the following flows in the Indian Ocean?
Which factor out of the following does not affect the region along the coast?
Which of the following occurs in the area where the cold and warm currents meet?
Which of these following currents flows from the northern polar region upto Antarctica?
Explain the effect of the meeting of warm and cold ocean currents.
How do winds give direction to the ocean currents?
Name the factors responsible for the subsurface movement of ocean waters.
How do evaporation and precipitation cause movement of ocean water?
Name the factors originating within the sea which cause ocean currents.
Give reasons for the following:
The eastern coasts of the USA are comparatively cold.
Give reasons for the following:
There is heavy rainfall in Queensland but the Atacama desert is arid.
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.
Describe one effect of the following ocean current.
Labrador Current of the Atlantic Ocean.
Describe one effect of the following ocean current.
The Kuroshio current
Describe one effect of the following ocean current.
Oyashio Current of the Pacific Ocean.
Describe the circulation pattern of the following ocean current.
The North Atlantic Drift.
What is the effect of Gulf Stream on the coasts of North America?
Describe three major effects of currents.
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 do currents affect the temperature?
How does currents affect the temperature of coastal areas in the N. W. Europe?
