Chapter 2 of 17
Syllabus
Earth's Origin and Evolution — Syllabus
Gujarat Board · Class 11 · Geography
What Earth's Origin and Evolution covers in Gujarat Board Class 11 Geography: 4 topics, for the 2026-27 session.
45 questions24 flashcards5 concepts
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4 Topics · Gujarat Board Class 11 Geography · 2026-27
Topics in Earth's Origin and Evolution
1
Ancient Views and Beliefs about Earth's Origin
- Ancient civilizations had various mythological explanations for Earth's origin
- Hindu mythology: Earth created from golden egg by Lord Brahma, supported by four elephants on a tortoise (Kurma)
- Croatian belief: Earth as an egg created by Sun God
2
Scientific Theories of Earth's Origin
- Three main categories: Monistic, Binary Star (Dualistic), and Gaseous-Dust Cloud theories
- Earth formed approximately 4.5 billion years ago as hot ball of gases
- Initially intensely hot, gradually cooled to form solid outer crust
3
Monistic Hypotheses
- Gaseous Hypothesis by Immanuel Kant (1755): Cold, motionless gaseous cloud in space began colliding due to gravitational attraction, forming hot spinning nebula
- Nebular Hypothesis by Laplace (1796): Modified Kant's theory, proposed hot rotating nebula gradually cooled and contracted, releasing rings that formed planets
- Both theories assume single parent body (Sun) as source of planetary material
4
Binary Star Hypotheses
- Planetesimal Hypothesis by Chamberlain and Moulton (1900): Passing star's gravity pulled material from Sun, forming planetesimals that became planets
- Later supported by James Jeans and Harold Jeffreys
- Explains planetary formation through stellar encounter
Key Concepts
Various mythological and religious explanations includingSingleTwoModern theories including Otto Schmidt's InterA system with the Sun at
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What are the important topics in Earth's Origin and Evolution for Gujarat Board Class 11 Geography?
Key topics in Earth's Origin and Evolution include Ancient Views and Beliefs about Earth's Origin, Scientific Theories of Earth's Origin, Monistic Hypotheses, Binary Star Hypotheses. Study these first, then practise questions on each for Class 11 exams.
How should I revise Earth's Origin and Evolution for Class 11 exams?
Learn the core ideas first, then work through the 45 practice questions on Earth's Origin and Evolution. Revise definitions regularly and use flashcards for quick recall before the exam.
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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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