Distribution of Oceans and Continents - Chapter 4 Geography NCERT Class 11
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- Опубліковано 7 жов 2024
- Lecture video, notes, summary on Distribution of Oceans and Continents - Chapter 4 Geography NCERT books Class 11 | Part 2 - Fundamentals of Physical Geography. It will help you for revision, note making for upsc csat ias, school and competitive exams.
continental drift theory
plate tectonics
abraham ortelius theory
earth plates
wegener's evidence
ncert solutions
cbse
Video on different layers of the earth @ 5:15
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Video on continental drift theory by Alfred Wegener @ 1:44 & 3:51
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Evidences of continental drift theory @ 1:48
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You can also view playlists of other NCERT Geography videos:-
Class 6 - goo.gl/DDFtIF
Class 7 - goo.gl/ppPK05
Class 8 - goo.gl/OD3Gwh
Class 9 - goo.gl/AIEXxQ
Class 10 - goo.gl/inWIAR
Class 11 - goo.gl/Pn5EIE
Class 11 (Part 2) - goo.gl/X4zY9K
Class 12 - goo.gl/Kszpz5
At 20:49.. It is the heavier plate that subsides not the lighter plate..
(Note: Oceanic plate is made of basalt and is heavier than the Continental plate which is made of Granite)
In convergent plate tectonics, we have 3 cases :
Case 1. Ocean Plate- Continent plate convergence : Here the Oceanic plate being heavier subsides beneath the continental plate. The subducted part of the oceanic plate goes into the asthenosphere and due to high heat in the asthenosphere, the oceanic plate melts and its volume increases( density decreases), thereby due to high volume and low density, the magma comes out of the earth's crust from fissures forming island arcs. Trenches are also formed at the point(all along the oceanic and continential plate convergence) where oceanic plate subsides beneath the continental plate.
Eg: The Nazca (and, to a lesser extent, Antarctic) plate subducting under the South American Plate, meanwhile, uplifted the Andes and peppered that towering range with volcanoes.
Case 2. Oceanic plate- Oceanic plate convergence : Both plates being heavier ( made of basalt) will push each other, but the heaviest plate will subside forming island arcs and trenches as explained above.
An example of an oceanic/oceanic convergent boundary is that between the Pacific and Mariana plates, which includes the Mariana Islands arc and a subduction zone encompassing the Mariana Trench, the deepest part of the World Ocean.
Case 3: Continental plate- Continental plate convergence: As both plates being lighter( made of granite), none will subside. Both will push against each other, and as none subsides, they will result into fold mountains. ( Jab koi plate niche ni ja skti ek dusre ke against push karke, to common sense kehta hai wo upar ko fold hojayengi)
eg: The classic example of a continental/continental convergent boundary is the rumpled overlap where the Indian Plate drives into the Eurasian Plate, a tectonic collision that has thrown up the greatest mountains in the world - the Himalayas - as well as the vast, high Tibetan Plateau. To the west, the Alps grew in similar fashion via the collision of the African and Eurasian plates.
Mujhe clear ni hua tha amit bhai ka video dekh k ye topic so I had researched a lot and wrote all this so that i can help someone.. Do thank me 😛
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Thank you
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Sir is saying that trenches occur at divergent boundary @9:04 but I've read they occur at convergent boundaries what do you think is it correct?
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20:49 In all types of convergence, the denser plate subducts, and the less dense plate is either up thrust or folded or both (upthrust and folded). 6:47 Trenches are formed in Convergent Boundaries/subduction zone.
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Amit sir you have done a remarkable job...one of the best ever explainations with illustrations...with due respect...but one mistake is there in Oceanic Trenches...deep Ocean trenches are are formed due to convergent boundaries..not by divergent plates.....basically..when two plates converge out of which heavier plate subduct into the lighter one...and when this happens Trenches forms.
Thank you.
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Great video Sir. But @6:43 I would like to mention that the trenches are formed when plates move towards each other and not apart! When they move apart, they make mid oceanic ridge.
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at 6:45 They (Trenches) usually occur when one plate (usually oceanic, denser) subducts under another lighter plate (usually continental)
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23:04 it is the soft mantle and the circular flow of heated material inside the earth which is the ............ force behind the plate movement. Can anyone fill the gap by watching the video at the time mentioned here.
Superb sir great continue this and thank you so much
Sir u teach in such a good manner. It helps us alot. Just one correction is needed in this video, Trench formed when two place collide with each other not move apart. One plate subducted and another moves upwars there Trench is formed. It is also known as Expression of subduction.
Source. Plate tectonic book of Condie.
Rest video is 👌
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Thank you so much for this lecture sir but I have one concern that you taught( 6:46) the ocean trench are formed due to two continental plates move away from each other, But sir I have studied that ocean trenches are formed due plate convergent (subduction zone) . I request to you please give clarification about the concert.
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