Yes they are.
Fossil fuels.
The three main fossil fuels are coal, oil and natural gas
The major fossil fuels are coal, oil, and natural gas.
Coal, Oil, and natural gas.
Coal, Oil and Gas.
Fossil fuels.
Fossil fuels (coal, oil and natural gas).
Coal is a fossil fuel. The major fossil fuels are natural gas, crude oil and coal.
Natural GasCoalOilMethane Clathrates (methane/water ices)
No, it is not. Coal, oil, and natural gas are fossil fuels.
Fossil fuels (coal, oil and natural gas).
oil and coal and natural gas