VIA A black, hard combustible substance mainly used as a fuel is a coal gas b. coal d. hydrocarbon 2. c. petroleum is the term used to denote any compound made of carbon and hydrogen. a. | Coke b. Coal C. Natural gas d. Hydrocarbon 3 d. Coal 4. is not an exhaustible natural resource. | Air b. Coke Petrol Petroleum is also known as liquid gold b. white gold brown gold variety of coal has highest carbon content. Lignite b. Bituminous Anthracite d. black gold C. 5. d. Peat C.
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coal
coal (not sure about this)
air
can't understand last one
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