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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
The temperature of the ocean waters generally_______ at greater depth.
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.
Assertion (A): Oceans are always shown in blue in maps.
Reason(R): It indicates the natural colour of the oceans.
Assertion(A): Submarine canyons are deep gorges on the ocean floor.
Reason(R): They are mainly restricted to continental shelf, slope and rise.
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 |
What are the factors that generate the ocean currents?
Explain the term
Oceanic Ridge
Assertion (A): Continental shelf is almost a uniform zone of sea bed with gentle gradient.
Reason (R): This enables sunlight to penetrate through the water.
Assertion (A): Ocean currents are in clockwise motion in the Northern Hemisphere and in the anti-clockwise motion in the Southern hemisphere.
Reason (R): The movement of ocean currents from high latitudes to low latitudes is called warm currents.
When was the National Institute oceanography established? What do they do?
