Alfred Wegener, being a meteorologist, had proposed tidal forces and centrifugal forces as the main driving mechanisms behind continental drift; however, these forces were considered far too small to cause continental motion as the concept was of continents plowing through oceanic crust. O Therefore, Wegener later changed his position and asserted that convection currents are the main driving force of plate tectonics in the last edition of his book in 1929 D However, in the plate tectonics context (accepted since the seafloor spreading proposals of Heezen, Hess, Dietz, Morley, Vine, and Matthews during the early 1960s), the oceanic crust is suggested to be in motion with the continents which caused the proposals related to Earth rotation to be reconsidered.
In more recent literature, these driving forces are: 1)Tidal drag due to the gravitational force the Moon (and the Sun) exert:s on the crust of the Earth 2) Global deformation of the geoid due to small displacements of the rotational pole with respect to the Earth's crust; 3)Other smaller deformation effects of the crust due to wobbles and spin movements of the Earth rotation on a smaller time scale. Forces that are small and generally negligible are: 1.The Coriolis force 2.The centrifugal force, which is treated as a slight modification of gravity
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Which of the following place(s) is/are associated with Guru Nanak? 1. India 2. Pakistan 3. Sri Lanka 4. Saudi Arab Select the correct answer using the code given below: (a) 1 only (b) 3 and 2 only (c) 1, 2 and 4 (d) 1, 2, 3 and 4
Which of the following place(s) is/are Answer: (D) associated with Guru Nanak? 1. India 2. Pakistan 3. Sri Lanka 4. Saudi Arab Select the correct answer using the code given below: (a) 1 only (b) 3 and 2 only (c) 1, 2 and 4 (d) 1, 2, 3 and 4 All the four places are associated with Guru Nanak JHe was born at Nankana sahib, Pakistan. It is said that Nanak undertoolk wide tours all over India, even beyond it, to Sri lanka in the south and Mecca and Madina in the West.
Consider the following statements with reference to Wheat crop: 1)lt is a crop of temperate region. 2)Aus, Aman and Boro are varieties of wheat crop. 3)lt is a kharif crop. Select the correct answer using the codes given below a)1 only b)2 and 3 only c)1 and 3 only d)1, 2 and3
Answer: (A) Standard conditions for wheat growth Consider the following statements with reference to 1)lt is a crop of temperate 2)Aus, Aman and Boro are wheat crop: 1. Low to moderate temperature around 2. Moderate rainfall around 3. Fertile alluvial soil. region. Wheat is mostly sown in the beginning of winter and is harvested in the beginning of summer, Wheat is a crop of temperate region and is mainly grown in temperate grasslands. three varieties of wheat cro p. 3)lt is a kharif crop. Select the correct answer using the codes given below It is a rabi(not Kharif) crop. a)1 only b)2 and 3 only c)1 and 3 only d)1, 2 and 3 Aus, Aman and boro are varieties of rice West Bengal farmers grow rice three times in a year which is called by these names
CASPIAN SEA Und iver Ural River Atyrau Astrakhan ITALY Volga River Kazakhstan Arol Sea Russia 125 m 125 km Tyrrhenian Sea Groznyy Aqtau Uzbekistan lonian Sea Georgia Tbilisi * CASPIAN SEA ITAY Turkmenistan enia *Yerevan Azerbaijan Baku Sumqayit urkmenbasy Mediterranean Sea KaNebitdaga Bogaz Bay Turkey Astara Ashgabat Tabriz NORTH IBYA 135 20 Iran Rasht Gorgan Chalus raq worldatlas Iran
UKRAINE ROMANIA Sea of Azov RUSSIA SERBIA Yalta Black Sea Soch BULGARIA Varna MACEDONIA Burgas GEORGIA Istanbulzonguldak Samsun Trabzon Aegean Sea TURKEY Athens 0 125 NORTH 125 NOBH50Mediterr
IRAQ AFGANISTAN IRAN PAKISTAN SAUDI ARABIA UA INDIA Finland Gulf of Bothnia Arabian Sea YEMEN Gulf of Finland ETHIOPIA Archipelago Baltic Sea Russia SRI LANKA Estonia KENYA Latvia Indian Ocean NORTH 1,000 2,000 Russia
Bay of Biscay FRANCE Barcelona, SPAIN AtlanticY Ocean Madrid Balearic Sea Valencia Lisbon Mediterranean Sea Gulf of Cadiz Cadiz Gibraltar Algiers Strait of GibrtaAlboran Sea ALGERIA Rabat Casablanca MOROCCO NORTH 0 50 100 200
Arctic Ocean SIA Kara Sea RO Loptev Se Barents Sea . East Stberian Sea Norwegian Sea North Sea Chukchi Sea Arctic Ocean Greeniand Sea Bering . Sea S00 Miles Beaufort 0 500 Kilometers Baffin Baye Atiantic Ocean Pacific NORTHAMERIC OGeoSystems
B.Tech NIT Allahabad. Have written UPSC Mains 2 times with Physics. Channel "Sumant Kumar" on Youtube for Current Affairs Analysis.