What are the advantages of using CNG and LPG as fuels?
Name the petroleum product used for surfacing of roads.
Describe how coal is formed from dead vegetation. What is this process called?
Fossil fuels are ________, ________ and ________.
Process of separation of different constituents from petroleum is called __________.
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Petroleum is used in many commerical work. Due to its great commercial importance, petroleum is called black gold.