Petroleum is the [[1]] source of energy.

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Detailed Solution

Petroleum is the conventional source of energy. A conventional source of energy refers to a kind of energy that cannot be used again if it is exhausted completely. It is also a kind of fossil fuel that takes millions and billions of years to be formed, just like coal it is also made from the dead remains of bacteria, plants, and algae. Petroleum is the second most important and major source of energy.

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