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Get CBSE Notes for Class 8 Science Chapter Chapter 5. Coal and Petroleum: Natural Resources prepared by experts as per the latest NCERT syllabus and CBSE exam pattern. These concise and easy-to-understand notes cover important definitions, formulas, diagrams, and key concepts from the chapter to help students in quick revision and effective exam preparation. Whether you are studying for school tests, board exams, or competitive exams, these notes provide a reliable study resource. Designed in simple language with point-wise explanations, they save time and enhance learning efficiency. Download free PDF notes, explore solved examples, and strengthen your understanding of [Topic Name] for scoring high marks. Perfect for Class 8 students who want clear, structured, and exam-oriented notes for CBSE Science.
Natural Resources : Air, water, soil and minerals these all are obtained from nature, they are called natural resources.
Natural Resources are classified into two types:
(i) Inexhaustible Natural Resources
(ii) Exhaustible Natural Resources
1. Inexhaustible Natural Resources : These resources are present in unlimited quantity in nature and are not likely to be exhausted by human activities.
Examples are: sunlight, air.
2. Exhaustible Natural Resources : The amount of these resources in nature is limited. They can be exhausted by human activities.
Examples of these resources are forests, wildlife, minerals, coal, petroleum, natural gas etc.
Fossil fuels: Some exhaustible natural resources like coal, petroleum and natural gas were formed from the dead remains of living organisms (fossils). So, these are all known as fossil fuels.
Causes to conservate the exhaustible natural resources:
(i) Exhaustible natural resources like fossil fuels are present in nature in limited quantity.
(ii) These resources can be exhausted in next generations.
(iii) The process of forming these resources are too longer.
(iv) Present generation should save these resources for up coming generations.
Coal: It is as hard as stone and is black in colour.
Uses of coal :
(i) Coal is one of the fuels used to cook food.
(ii) Earlier, it was used in railway engines to produce steam to run the engine.
(iii) It is also used in thermal power plants to produce electricity.
(iv) Coal is also used as a fuel in various industries.
(v) Coal is processed in industry to get some useful products such as coke, coal
tar and coal gas.
Carbonisation: the slow process of conversion of dead vegetation into coal is called carbonisation.
The process of forming coal:
About 300 million years ago, earth was having dense forests in low lying wet land areas. Due to earthquakes and vocaline erruptions, these forest got buried under the soil. As more soil deposited over them, they were compressed. The temperature also raised as they sank deeper and deeper. Due to high temperature and lack of oxygen dead plants inside the earth got slowly converted to coal.
Chemical properties:
Coal burns in abundant air and produces mainly carbon dioxide gas. In less air it produces carbon mono oxide. These are pollutants.
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Ace your exams with CBSE Notes for Class 8 Science chapter Chapter 5. Coal and Petroleum: Natural Resources. These notes provide a clear explanation of important concepts, formulas, diagrams, and solved examples from the NCERT syllabus. Specially designed for Class 8 students, the notes are structured in a simple, point-wise manner to make revision quick and effective. Whether you are preparing for school tests, board exams, or competitive exams, these Science notes will boost your confidence and save valuable study time. You can also download Science class 8 chapter Chapter 5. Coal and Petroleum free PDF notes for offline learning. With easy-to-grasp language, exam tips, and well-organized content, these CBSE Science notes on chapter Chapter 5. Coal and Petroleum – Natural Resources are the perfect study companion for scoring high marks and mastering the subject.
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