Question

Fill in the blanks:(a) Fossil fuels are ______, ______ and ______(b) Process of separation of different constituents from petroleum is called _____.(c) Least polluting fuel for vehicle is _____.

Solution

a) $$\text{Coal, petroleum and natural gas}$$ are the fossil fuels because these are formed by the dead remains of animals and plants buried under the earth billions of years ago.b)$$\text{Refining}-$$ In this process, various petroleum products like gasoline, diesel etc are formed.c) $$\text{CNG}-$$ It is called compressed natural gas which is methane stored at high pressure.ScienceNCERTStandard VIII

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