Coal and Petroleum class 8 | worksheet
Coal and Petroleum class 8. download coal and petroleum class 8 pdf worksheet based on the latest CBSE syllabus including MCQ Type questions on coal and petroleum, long questions and answers, define, and diagram based questions.
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.
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.
Due to natural processes, like flooding, these forests got buried under the soil. As more soil deposited over them, they were compressed. The temperature also rose as they sank deeper and deeper. Under high pressure and high temperature, dead plants got slowly converted to coal. As coal contains mainly carbon, the slow process of conversion of dead vegetation into coal is called carbonisation. Since it was formed from the remains of vegetation, coal is also called a fossil fuel. Coal is one of the fuels used to cook food. Earlier, it was used in railway engines to produce steam to run the engine. It is also used in thermal power plants to produce electricity. Coal is processed in industry to get some useful products such as coke, coal tar and coal gas.
Coke is a tough, porous and black substance. It is an almost pure form of carbon. Coke is used in the manufacture of steel and in the extraction of many metals.
Coal Tar is a black, thick liquid. It is a mixture of about 200 substances. Products obtained from coal tar are used as starting materials for manufacturing various substances used in everyday life and in industry, like synthetic dyes, drugs, explosives, perfumes.
Coal gas is obtained during the processing of coal to get coke. It is used as a fuel in many industries situated near the coal processing plants.
Heavy motor vehicles like trucks and tractors run on diesel Petrol and diesel are obtained from a natural resource called petroleum. The word petroleum is derived from petra (rock) and oleum (oil).
Petroleum was formed from organisms living in the sea. As these organisms died, their bodies settled at the bottom of the sea and got covered with layers of sand and clay. Over millions of years, absence of air, high temperature and high pressure transformed the dead organisms into petroleum and natural gas.
coal and petroleum are examples of exhaustible Natural Resources as these natural resources are very limited, after some year we will not be able to get coal and petroleum.
Why coal and petroleum are called fossil fuels
Coal and petroleum are called fossil fuels because coal and petroleum are obtained from the dead remain of plants and animals, as we know coal is formed from the dead remains of plants and petroleum are formed from the dead remains of animals.