Chapter 2 of 5
Concept Maps
What is around Us? — Concept Maps
Gujarat Board · Class 8 · Social Science
3 concept maps of What is around Us? for Gujarat Board Class 8 Social Science, each also written out as a text outline.
44 questions5 concepts
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3 Concept Maps
The Four Spheres of Earth — Chapter Overview
The map in words
- Earth and Its Spheres
- Lithosphere
- Meaning: Litho = Rock
- Coverage: 29 percent
- Thickness: 64 to 100 km
- Features
- Mountains
- Plateaus
- Plains
- Valleys
- Magma inside Earth
- Volcanic Eruption
- Uses
- Agriculture
- Minerals
- Forests
- Hydrosphere
- Meaning: Hydro = Water
- Coverage: 71 percent
- Four Oceans
- Pacific
- Atlantic
- Indian
- Arctic
- Oceans have 97 percent water
- Fresh Water is precious
- Uses
- Fish and minerals
- Electricity from tides
- Waterways
- Atmosphere
- Meaning: Atmo = Vapour
- Extends up to 1600 km
- Composition
- 78 percent Nitrogen
- 21 percent Oxygen
- 1 percent Others
- Ozone absorbs UV rays
- Condensation
- Dew
- Fog
- Clouds
- Precipitation
- Biosphere
- Living world zone
- Only on Earth
- Living Part
- Plants
- Animals
- Micro organisms
- Non Living Part
- Lithosphere
- Hydrosphere
- Atmosphere
- Human Impact
- Lithosphere: Mining and drilling
- Hydrosphere: Industrial waste and oil spills
- Atmosphere: Vehicle emissions and deforestation
- Biosphere: All threats combined
- Lithosphere
The Four Spheres of the Earth – Concept Overview
The map in words
- Four Spheres of Earth
- Lithosphere
- Litho means Rock
- Covers 29 percent
- 64 to 100 km thick
- Landforms
- Mountains
- Plateaus
- Plains
- Valleys
- Magma inside
- Volcano eruption
- Uses
- Agriculture
- Minerals
- Forests
- Hydrosphere
- Hydro means Water
- Covers 71 percent
- Four Oceans
- Pacific
- Atlantic
- Indian
- Arctic
- 97 percent salty water
- Fresh water is precious
- Uses
- Drinking
- Fishing
- Electricity
- Transport
- Atmosphere
- Atmos means Vapour
- Extends 1600 km
- Composition
- 78 percent Nitrogen
- 21 percent Oxygen
- 1 percent Others
- Ozone layer
- Condensation forms
- Dew
- Fog
- Clouds
- Rain
- Biosphere
- Bio means Life
- Where life exists
- Only on Earth
- Living part
- Plants
- Animals
- Microorganisms
- Non living part
- Lithosphere
- Hydrosphere
- Atmosphere
- Lithosphere
The Four Spheres of Earth - Hierarchical Overview
The map in words
- Earth's Four Spheres
- Lithosphere
- Solid rock layer
- 29% of surface
- 64-100 km thick
- Landforms
- Magma interior
- Hydrosphere
- Water bodies
- 71% of surface
- Oceans
- Freshwater
- Marine life
- Atmosphere
- Gases layer
- 1600 km height
- 78% Nitrogen
- 21% Oxygen
- Other gases
- Ozone layer
- Biosphere
- Living organisms
- Plants and animals
- Microorganisms
- Humans
- Ecosystems
- Lithosphere
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Explore DiagramsFrequently 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.
What do the concept maps for What is around Us? show?
The 3 maps show how the ideas in What is around Us? connect: The Four Spheres of Earth — Chapter Overview; The Four Spheres of the Earth – Concept Overview. Each map is also written out as an outline on this page.
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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