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Continental Drift Theory & Seafloor Spreading - Physical Geography
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This lesson pertains to Continental Drift Theory and Sea Floor Spreading. Bhanwar by this lesson explains Continental Drift Theory, the evidences which explains the hypothesis and also the phenomenon of sea floor spreading.

Bhanwar Singh
Ex- National Defence Academy (115 Course) Cleared Civil Services Examination, 2012

U
Unacademy user
sir then what is special majority + ratification. please explain
Arka Sen
9 months ago
ratification hoga tabbhi jaab States ka consent cahiye. Like at time of Federal Structure , Changes to be made in Election of President, Representation of States in Parliament. Half of states consent ia required. { if centre got half of states consent and rest states didn't get any consent then it won't effect anything, the moment they got half of consent bill is passed}
but sir in ncert geography book the year in which alfred wegener gave the theory is 1912 and the PANGAEA started to break around 200 million years ago...sir kindly clear my doubts
Bhanwar Singh
3 years ago
Post question in QnA tab. Will be helped. This section is only for comments.. See anything in QnA tab will be checked by viewers and it will help wide community.. Not here.
R
Ritu
3 years ago
Hello sir how's you?? I am ritu here from mahendra' s GA faculty
Ds
Dinesh sharma
2 years ago
please make a video for national defence academy and ssb
Please Make A Course On World Geography In HINDI.....
How I joion CDs exam
i have watched whole video thank you so much for this great effort and it​would be helpful if you would explain terms like Cretaceous period and other terms which come intermittently
Indira Banerjee
2 years ago
please go through geological timeline scale..you will able to understand all the terms.
Thank you for this wonderful lesson .Lectures are very informative and good.if possible please explain previous year questions.
i want to download slides of this video.. is there any option..?
y don't u take screenshots of those slides brother?
  1. CRASH COURSE-WORLD GEOGRAPHY Presented by - Bhanwar Singh Sirohi


  2. PHYSICAL GEOGRAPHY - CONTINENTAL DRIFT THEORY AND SEA FLOOR SPREADING


  3. ABOUT ME BA. (Hons) in Law from Awadh University I Defence Academy (115 Course) Cleared Civil Services Examination, 2012 Hobbies - Writing Poetry Course Fee Contribute Follow me on Unacademy at: https://unacademy.in/user/sirohib


  4. CONTINENTAL DRIFT THEORY oet Tihe origin orcloninen Given by German geologist and meteorologist Alfred Wegner in 1 915 in his book, The Origin of Continents and Ocean:s According to this theory parts of Earth's crust slowly drifts over the liquid it Alfred Wegner in 1915 in hia mantle This theory was supported by fossil records There was a gigantic supercontinent which existed about 280 million years ago, named Pangea and one super-ocean called Panthalsa Pangea started to break into small supercontinents, named Laurasia and Gondwanaland about 150 million years ago (during Jurassic period) By the end of Cretaceous period, the continents separated into land masses that look like our modern day continents


  5. GLANCE AT SOME EVIDENCES FOSSIL EVIDENCES Fossil plant Glossopteris found throughout India, South America, Southern Ossil plan Glssoprerls rouhd tnroughour Indld, SoUn Americd, 3ournern Africa, Australia and Antarctica Fossil of Mesosaurus found in both South America and South Africa Glacier deposits left over from million of years ago all over the southern hemisphere Similarity in rock structure on opposite sides of the Atlantic Ocean JIGSAW FIT S. America especially Brazil fits into Gulf of Guinea of Africa Antarctica fits into S. Australian Coast and S. E. African coast NW Australian coast fits E Indian Coast


  6. Fossil evidence of the Tiassic land reptile Lystrosaurus. AFRICA INDIA SOUTH AMERICA AUSTRALIA AN ICA Fossil remains of Cynognathus,a tiassic land reptile approximately 3m long. Fossil remains of the freshwater reptile Mesosaurus Fossils of the fern Glossopteris. found in all of the southem continents, show that they were once joined


  7. HYPOTHESIS The Pangea broke into continents that drove away in two directions Equatorward and Westward The movement towards Equator was because of Gravitational Differential Force or Centrifugal Force Force of Buoyancy The movement towards Westward direction was due to The tidal force of Sun and Moon The Pangea seperated in Angaraland or Laurasia and Gondwanaland in the Carboniferous period and the space between the two was filled with water - Tethys Sea


  8. HYPOTHESIS Laurasia consisted of North America and Greenland & Eurasia (without India and Arabia) Gondwanaland consisted of Africa (with Arabia), South America, Australia, Antarctica and India South Pole was located near Durban, near Natal in South Africa During the Cretaceous period, eruption took place on Gondwanaland and also the Indian subcontinent, Madagascar, Australia and Antarctica broke away from it. Similarly the North America broke away and moved westwards due to Tidal forces


  9. BEFORE SEPERATION AFTER SEPERATION


  10. TRIAs 200 milhon years ago CRET ACEOUS so million years 900 PRESENT DAY