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Plate Tectonics and the movement of the Indian plate
प्लेट विवर्तनिकी और भारतीय प्लेट की गति
In this Class 11 Geography topic from “Distribution of Oceans and Continents,” students learn how plate tectonics explains the changing arrangement of continents and ocean basins. They study the structure and movement of lithospheric plates, the major types of plate boundaries, and the forces linked to their motion. The topic traces the Indian plate’s journey from Gondwana, its northward movement, and its collision with the Eurasian plate, connecting these processes with the formation of the Himalayas, earthquakes, and volcanism.
Practice questions
01 After the Indian Plate separated from Gondwanaland which process promoted the formation of oceanic crust during its northward journey?
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Answer and explanation
Correct answer: B. Sea floor spreading
Explanation: Sea floor spreading forms new oceanic crust and plates move apart. It is a basic process for understanding the Indian Plate journey.
09 The uplift of the Tibetan Plateau due to Indian Plate movement is best explained by what?
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Answer and explanation
Correct answer: A. Crustal thickening and internal compression
Explanation: Collision of the Indian Plate compressed the Eurasian part and thickened the crust. This is linked with the high uplift of the Tibetan Plateau.
15 Which landform developed because the Indian Plate collided in the north rather than simply sinking?
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Answer and explanation
Correct answer: A. Young fold mountains
Explanation: When two continental plates move towards each other, neither plate easily sinks like dense oceanic crust. Their edges are pushed together, producing strong compression. The rocks may bend, fold, and rise over a long period. This process is called mountain building, and it commonly creates young fold mountains. The collision of the Indian Plate with the Eurasian Plate produced the Himalayan mountain system.
A mid-oceanic ridge generally develops where plates move apart and new oceanic crust forms. Coral islands and deltas are produced by different coastal or depositional processes, not by the direct compression of a continental collision. Thus the landform linked with the northern collision of the Indian Plate is the young fold mountain, making option A correct.
23 Why are high grade metamorphic rocks found in the Himalayas after Indian Plate collision?
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Answer and explanation
Correct answer: A. Intense compression buried rocks deeper, increasing temperature and pressure
Explanation: Convergence of the Indian and Eurasian plates subjected Himalayan rocks to intense compression and buried many of them deeply. Higher temperature and pressure at depth caused minerals to recrystallise, producing high-grade metamorphism. Deposition of sea salt is a sedimentary process, not the cause of metamorphism. Exam tip: link high-grade metamorphism with high temperature, high pressure, and deep burial.
24 What is the importance of the Main Central Thrust in the context of the Indian Plate?
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Answer and explanation
Correct answer: A. It indicates large scale movement of Himalayan crustal slices
Explanation: The Main Central Thrust is linked with Himalayan compression and overriding of rock slices. Treat it as a structural expression of plate collision.
25 Why did intense river incision increase after the Indian Plate collided with Eurasia?
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Answer and explanation
Correct answer: A. Uplift increased slope and river energy
Explanation: Convergence of the Indian and Eurasian plates uplifted the Himalayas. Uplift steepened river gradients, increasing flow velocity and erosive power, so rivers cut more deeply into their channels. Option B is incorrect because a rise in base level generally reduces vertical incision. Exam tip: Link mountain uplift with steeper gradients and stronger river erosion.
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