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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 a vehicle is ______________ .
Answer :

(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 a vehicle is __compressed natural gas___.