TOPIC OCEAN CURRENT (GEOGRAPHY)
Factors Influcencing Nature and Movement of Ocean Current:
1. Factors related to the earth’s rotation: gravitational force and force of deflection.
2. Factors originating within the sea: atmospheric pressure, winds, precipitation, evaporation and isolation.
3. Factors originating within the area: pressure gradient, temperature difference, salinity, density and malting of ice.
4. Factors modifying the ocean currents: direction and shape of the coast, seasonal variations and bottom tapography.
General Characteristics of Ocean Currents
These characteristics arise as a result of interplay of the above mentioned factors and include the following.
1. The general movement of the currents in the northern hemisphere is clockwise and in the southern hemisphere, anti-clockwise (Fig 3.7) This is due to the Coriolis force which is a deflective force and follows Ferrel’s law. A notable exception to this trend is seen in the northern part of the Indian Ocean where the current movement changes its direction in response to the seasonal change in the direction of monsoon winds.
2. The warm currents more towards the cold seas and cool currents towards the warm seas.
3. In the lower latitudes, the warm currents flow on the eastern shares and cold on the western shores. The situation is reversed in the higher latitudes – the warm currents move along the western shares and the cold currents along the eastern shares.
4. Convergence along which the warm and cold currents meet and divergence from which they move out in different directions also control the currents.
5. The shape and position of coasts play an important role in guiding the directions of currents.
6. The currents flow not only at the surface but also below the sea surface. Such currents are caused by the differences in salinity and temperature. For instance, heavy surface water of the Mediterranean Sea sinks and flows westward past Gibraltar as a sub – surface current.
Given below is a survey of ocean currents in three major oceans.
Topics to be covered from Hindu Paper dated on Friday November 23rd
Topic
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Page No.
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Trinamool’s move for no-trust motion fails
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1
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ITU can’t be allowed to regulate content and free speech, says Sibal
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1
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Indira Gandhi Peace Prize presented to former Brazilian President Lula
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11
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Sealing the cracks
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12
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An act of constitutional impropriety
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12
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In China, unwritten rules of the education game
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13
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Two deaths and a common chorus
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13
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Going from Pillar to truce
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13
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Civil society & industry oppose India’s plans to modify ITRs
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15
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Now, IAC fights for hurt NSG commandos
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15
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QUESTIONS
1.Consider the following statement/s with regards to National Mission on Education through Information and Communication Technology.
1.The Mission aims to extend computer infrastructure and connectivity to over 25000 colleges.
2.The Mission, in addition to utilize the connectivity network of service providers, shall explore the possibility to provide connectivity utilizing Very Small Aperture Terminal (VSAT), Virtual Private Network (VPN) and EduSat channels.
3.Under the mission The Minister of Human Resource Development unveiled a low cost access-cum-computing device (LCAD) name Gagan.
Incorrect statement/s is/are
(a)Only 1(b)Only 2
(c)Only 3(d)None of above
2.Consider the following statements
1.The DFC project is a marvel of Planning, engineering, design and technology. In the first phase of DFC mega project has taken up two corridors the Eastern Corridor from Ludhiana (Punjab) to Dankuni (West Bengal) and the Western Corridor JNPT (Mumbai) to Dadri.
2.The prime objectives for building these dedicated freight corridors are to create additional rail infrastructure to cater to increased transport demand as well as to reduce unit cost of transportation.
3.The Dedicated freight corridors are capable to hold the burden of double stack containers.
Correct statement/s is/are
(a)1 and 2(b)1 and 3
(c)2 and 3(d)All above
3.UNSMIS , in news, relates to
(a)Libya
(b)Small Scale Industries
(c)Computer Technology
(d)Syria
4.India has received first Embraer Jet from
(a)France(b)UK
(c)Brazil(d)USA
5.POCSO Act 2012 deals with
(a)Child rights protection
(b)Foreign investment
(c)Women Development
(d)Backward section of the society
