Chapter 2 of 5
Revision Notes
What is around Us? — Revision Notes
Gujarat Board · Class 8 · Social Science
What is around Us? revision notes for Gujarat Board Class 8 Social Science: 4 topics in quick points. Includes Origin of Earth and the Four Spheres.
44 questions5 concepts
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Key Topics to Revise
1
Origin of Earth and the Four Spheres
- Earth is a member of the Solar Family (Solar System).
- It is believed that Earth was formed from a part of the Sun that detached after a collision.
- At the time of its origin, Earth was a fireball that slowly cooled down.
2
Lithosphere
- 'Litho' means rock and 'sphere' means layer.
- Lithosphere covers approximately 29% of Earth's surface — it is the land part.
- It is approximately 64 km to 100 km thick (thickness varies from place to place).
3
Hydrosphere
- Hydrosphere is the liquid component of Earth — includes all water bodies.
- It covers 71% of Earth's surface — more than lithosphere.
- Includes: oceans, seas, lakes, ponds, rivers, streams, glaciers, and groundwater.
4
Atmosphere
- Atmosphere is the sphere of air that wraps around the Earth from all sides.
- It extends approximately up to 1600 km from Earth's surface.
- Cannot be seen clearly with the naked eye (unlike Lithosphere and Hydrosphere).
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Full NotesKey Concepts
Earth is composed of four majorThe lithosphere is the outermost solidThe hydrosphere comprises all the waterThe atmosphere is the spherical layerThe biosphere is the zone where
Frequently Asked Questions
What are the important topics in What is around Us? for Gujarat Board Class 8 Social Science?
Key topics in What is around Us? include Origin of Earth and the Four Spheres, Lithosphere, Hydrosphere, Atmosphere. Study these first, then practise questions on each for Class 8 exams.
How should I revise What is around Us? for Class 8 exams?
Learn the core ideas first, then work through the 44 practice questions on What is around Us?. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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