They are called fossil fuels.
Coal is a fossil fuel. The major fossil fuels are natural gas, crude oil and coal.
Coal, Oil, Natural gas. Coal first, Natural gas second, Oil third.
fossil
Natural GasCoalOilMethane Clathrates (methane/water ices)
I have questioned that to, but greatly think it's oil.
Gas, Oil and Coal
No it is not. But Crude Oil, coal, and Natural Gas are!
oil and coal
Mainly coal and oil, but also natural gas.
No, it is not. Coal, oil, and natural gas are fossil fuels.
Fossil fuels (coal, oil and natural gas).
Coal, Natural Gas and Oil