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प्रश्न
Explain the types of ocean currents.
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उत्तर
The factors that generate ocean currents are:
- Earth’s rotation
- Prevailing winds and
- Differences in temperature and salinity of ocean water.
On the basis of temperature, ocean currents are classified as warm currents and cold currents. The movement of ocean currents from the low latitudes (tropical zones) towards high latitudes (temperate and polar zones) is called warm current, e.g. Gulf Stream in Atlantic Ocean, North Equatorial Current in Pacific Ocean.
The movement of ocean currents from high latitudes (temperate and polar regions) to low latitudes (tropical regions) is called cold currents, e.g. Labrador Current in Atlantic Ocean and Peruvian Current in Pacific Ocean.
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संबंधित प्रश्न
Which of the following is not correctly matched?
- Gulf Stream - Pacific Ocean
- Labrador current - North Atlantic Ocean
- Canary current - Mediterranean sea
- Mozambique current - Indian Ocean.
Match the following:
| 1. | Mariana trench | Decreases salinity in the oceans |
| 2. | Great Barrier Reef | Along the coast of Japan |
| 3. | Spring tides | Deepest point in the Pacific |
| 4. | Heavy rains | Australia |
| 5. | Kuroshio current | Second order landform |
| 6. | Continental slope | On full and new moon days |
The northern hemisphere and the southern hemisphere are called land and water hemispheres respectively.
Consider the following statement.
- Sylvia Earle is a famous American oceanographer
2. The continental shelves have extensive deposits of mineral fuels.
3. Submarine fans are located in continental slope.
4. Abyssal plains are otherwise called shallow sea plains.
Assertion (A): On the basis of temperature, ocean currents can be classified as warm currents and cold currents.
Reason (R): The movement of ocean current from the low latitudes towards high latitudes cause cold current.
Assertion(A): Salinity is higher in closed ocean basins.
Reason(R): Enclosed ocean basins undergo little mixing with the open ocean.
What role is played by NIO (National Institute of Oceanography)
When was the National Institute oceanography established? What do they do?
The oceans are salty. Why?
“Though Caspian Sea is enclosed its salinity is just 14 to 17 parts per thousand. Why is it so?
