What type of fuel are coal, petrol and natural gas?
A
Biofuels
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B
Electrical fuels
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C
Primary fuels
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D
Liquid fuels
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Solution
The correct option is D Primary fuels Coal, petroleum and natural gas are primary fuels formed as a result of the decomposition of buried dead organisms some millions of years ago which may exceed 650 million years. These are also known as fossil fuels.