Which of the following is a conventional source of energy?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. Firewood.
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Conventional sources of energy are the natural energy resources which are present in a limited quantity and are being used for a long time.
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They are called non-renewable sources as once they are depleted, they cannot be generated at the speed which can sustain its consumption rate.
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They are formed from decaying matter over hundreds of millions of years.