Distribution of Oceans and Continents
CBSE · Class 11 · Geography
Summary of Distribution of Oceans and Continents for CBSE Class 11 Geography. Key concepts, important points, and chapter overview.
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Overview
The surface of Earth is divided unevenly between land and water. Continents cover 29 per cent of the Earth’s surface, while the remaining area is oceanic. The positions of continents and oceans have changed in the past and will continue to change in the future. The chapter explains how scientists id
Key Concepts
Alfred Wegener put forward the continental
Alfred Wegener put forward the continental drift theory in 1912. He argued that all continents were once joined together in a single landmass and late
Pangaea means all earth and refers
Pangaea means all earth and refers to the super continent formed by all continents together. Panthalassa means all water and refers to the ocean that
The Atlantic coastlines of Africa
The Atlantic coastlines of Africa and South America show a remarkable fit. Bullard’s 1964 computer-generated map showed the best match at the 1,000-fa
A belt of ancient rocks
A belt of ancient rocks of 2,000 million years from the Brazil coast matches rocks from western Africa. The earliest marine deposits along South Ameri
Tillite is a sedimentary rock formed
Tillite is a sedimentary rock formed from glacier deposits. Gondwana tillite counterparts are found in Africa, Falkland Island, Madagascar, Antarctica
Learning Objectives
- Understand the idea that continents and oceans have changed their positions over geological time
- Explain the continental drift theory proposed by Alfred Wegener
- Identify the main evidence used to support continental drift
- Describe sea floor spreading and its role in explaining ocean-floor movement
- Understand plate tectonics as the unifying theory of moving lithospheric plates
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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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