Fill in the blanks.

(a) Fossil fuels are _________, _________ and _________.

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

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(c) Least polluting fuel for vehicle is _________.

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.