Fill in the banks. (a) Fossil fuels are ________, ________and _________. 

(b) Process of separation of different constituents from petroleum is called _________. 

(c) Least polluting fuel for vehicles is __________. 

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1 Answers

(a) Fossil fuels are coal, petroleum and natural gas. 

(b) Process of separation of different constituents from petroleum is called refining. 

(c) Least polluting fuel for vehicles is CNG.

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