Distribution of Oceans and Continents
CBSE · Class 11 · Geography
Complete topic list for Distribution of Oceans and Continents in CBSE Class 11 Geography. Key concepts, sub-topics, and what to focus on for board exams.
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Topics in Distribution of Oceans and Continents
Continental Drift and Early Ideas
- Abraham Ortelius first proposed in 1596 that continents were once joined.
- Antonio Pellegrini drew a map showing the three continents together.
- Alfred Wegener put forth the continental drift theory in 1912.
Evidence for Continental Drift
- The coastlines of Africa and South America facing each other show a remarkable match.
- Bullard produced a computer-generated map in 1964 showing the best fit of the Atlantic margin between Africa and South America.
- The fit was found at the 1,000-fathom line.
Ocean Floor Relief and Sea Floor Spreading
- The ocean floor has three major divisions: continental margins, deep-sea basins, and mid-ocean ridges.
- Continental margins form the transition between continental shores and deep-sea basins.
- Deep-oceanic trenches are important parts of continental margins.
Plate Tectonics and Plate Boundaries
- McKenzie and Parker, along with Morgan, independently collected available ideas in 1967 and formulated Plate Tectonics.
- The earth's lithosphere is divided into seven major plates and some minor plates.
- A tectonic plate, or lithospheric plate, is a massive irregular slab of solid rock.
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Central concept: Distribution of Oceans and Continents
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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