EASY
8th CBSE
IMPORTANT
Earn 100

Petroleum is also known as black gold.

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Important Questions on Coal and Petroleum

EASY
8th CBSE
IMPORTANT
The process of formation of petroleum is called carbonisation.
MEDIUM
8th CBSE
IMPORTANT
Explain the formation of coal by natural processes.
HARD
8th CBSE
IMPORTANT
Explain refining of petroleum with the help of a diagram.