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Question

Fill in the following blanks with suitable words :

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

(b) Coal contains mainly ___ .

(c) The slow process of conversion of dead vegetation into coal is callled ___ .

(d) The process of separation of different constituents from petroleum is called ___ .

(e) The least polluting fuel for vehicles is ___ . 

(f) The burning of fossil fuels causes air ___ and also leads to global ___ .


Solution

a) Fossil fuels are coalpetroleum and natural gas.
b) Coal contains mainly carbon
c)The slow process of conversion of dead vegetation into coal is callled carbonization.
d) Process of separation of different constituents from petroleum is called refining.
e) The least polluting fuel for vehicles is compressed natural gas.
f) The burning of fossil fuels causes air pollution   and also leads to global warming.

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