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Revision Notes
Coal and Petroleum — Revision Notes
Gujarat Board · Class 8 · Science
Coal and Petroleum revision notes for Gujarat Board Class 8 Science: 4 topics in quick points. Part of the Gujarat Board Class 8 Science syllabus.
45 questions5 concepts
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Key Topics to Revise
1
Natural Resources: Exhaustible and Inexhaustible
- Natural resources are materials obtained from nature that are used by living beings.
- Inexhaustible Natural Resources: Present in unlimited quantity; cannot be exhausted by human activities. Examples: Sunlight, Air.
- Exhaustible Natural Resources: Present in limited quantity; can be exhausted by human activities. Examples: Coal, Petroleum, Natural Gas, Forests, Wildlife, Minerals.
2
Coal: Formation, Types of Products and Uses
- Coal is a hard, black substance found under the earth. It is mainly made up of carbon.
- FORMATION OF COAL: About 300 million years ago, dense forests in low-lying wetland areas got buried under soil due to natural processes like flooding. Over time, more soil deposited, compressing the d
- The slow process of conversion of dead vegetation into coal is called CARBONISATION.
3
Petroleum: Formation, Refining and Products
- Petroleum is a dark oily liquid with an unpleasant odour found between rocks under the earth. The word comes from 'petra' (rock) and 'oleum' (oil).
- FORMATION OF PETROLEUM: Petroleum was formed from organisms (plants and animals) living in the sea. When these organisms died, their bodies settled at the sea bottom and got covered with layers of san
- The layer containing petroleum and natural gas is above the water layer because oil and gas are lighter than water and do not mix with it.
4
Petroleum Products and Their Uses (Important Table)
- 1. LPG (Liquefied Petroleum Gas) → Fuel for home cooking and industry
- 2. Petrol → Motor fuel (cars, scooters), aviation fuel, solvent for dry cleaning
- 3. Kerosene → Fuel for stoves and lamps, fuel for jet aircraft
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Full NotesKey Concepts
Fossil fuels are energy sources formedCoal is a blackWhen coal is processed in industryPetroleum (meaning 'rock oil') was formedPetroleum refining is the process
Frequently Asked Questions
What are the important topics in Coal and Petroleum for Gujarat Board Class 8 Science?
Key topics in Coal and Petroleum include Natural Resources: Exhaustible and Inexhaustible, Coal: Formation, Types of Products and Uses, Petroleum: Formation, Refining and Products, Petroleum Products and Their Uses (Important Table). Study these first, then practise questions on each for Class 8 exams.
How should I revise Coal and Petroleum for Class 8 exams?
Learn the core ideas first, then work through the 45 practice questions on Coal and Petroleum. 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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