They have been formed over millions of years as dead animals and plants have been crushed and compressed by the weight of the ever-increasing material on top of them. Their age, along with the fact that they are unrenewable sources i.e. they will never be re-made, leads to the fact that 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.
Petroleum, coal, and natural gas are a few types of 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)
Fossil fuels (coal, oil and natural gas).
No, it is not. Coal, oil, and natural gas are fossil fuels.
Oil, Coal and Natural Gas are all Natural Resources that happen to be non-renewable fossil fuels.
oil and coal and natural gas
coal and natural gas