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Fill in the blanks. (a) The slow process of conversion of dead vegetation into coal is called__________. (b) Coal and petroleum are formed from the dead remains of organisms and are known as __________. (c) The black thick liquid with __________ smell is known as coal tar. (d) During the processing of coal to get coke, coal tar and __________ are also obtained. (e) The process of separating the various constituents of petroleum is known as __________. (f) Excessive burning of fossil fuels is a major cause of __________. |
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Answer» (a) carbonisation, (b) fossil fuels, (c) unpleasant, (d) coal gas, (e) refining, (f) air pollution. |
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