Carbonization is the process of slow conversion of dead plants into coal under high pressure, temperature and in absence of air.
b) Fossil fuels
Coal and petroleum are known as fossil fuels as they are obtained from dead remains of plants and animals.
Coal tar is a product of coal which is a thick black liquid with unpleasant smell used for road surfacing.
d) Coal gas
Coal gas is a product of coal which is a gaseous fuel obtained during processing of coal to get coke.
Refining is the process of separating various components of petroleum in a refinery and this method employs fractional distillation technique.
f) Air pollution
Fossil fuels mainly contain carbon and burning of these fuels release carbon dioxide gas which causes air pollution.
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