A= The three main sources are coal, petroleum and natural gas.
Source - Wikipedia
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Coal, oil, and natural gas are the main three nonrenewable primary energy sources.
The main sources of energy in Canada are oil, hydroelectricity, and solar power.
The main energy source is the sun
solar, wind, geothermal
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sun, water, wind.there may be others, but those are some of the most typical
The main sources of chemical energy are compounds. Some of the common energy sources include gas, food, oil and so many more.
The main sources are hydro-electric, natural gas and oil.
Coal and uranium
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sun