Petroleum, ________ and ________ are fossil fuels.
(d) Petroleum, Coal and natural gas are fossil fuels.
Decomposing plants and other organisms, buried beneath layers of sediment and rock, have taken millennia to become the carbon-rich deposits we now call fossil fuels. Fossil fuels contain high percentages of carbon and include petroleum, coal, and natural gas. Oil is the most widely used fossil fuel. If we keep burning fossil fuels at our current rate, it is generally estimated that all our fossil fuels will be depleted by 2060.
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