Because it is the fossilised remains of vegetation that grew years ago
Because it will run out someday
coal is a type of solid fossil fuel and is formed from the remains of plant life.
Coal is a solid fossil fuel, if that's what you're looking for.
it already is coal is fossilised wood
coal
Coal, methane gas, oil are fossil fuels; uranium is not a fossil fuel.
Coal is fossil fuel.
Coal is a fossil fuel. The major fossil fuels are natural gas, crude oil and coal.
Because it will run out someday
Fuel from coal and petroleum, which is believed to be of fossil origin.Fuel from coal and petroleum, which is believed to be of fossil origin.Fuel from coal and petroleum, which is believed to be of fossil origin.Fuel from coal and petroleum, which is believed to be of fossil origin.
Fossil
Coal is a fossil fuel.
Yes, coal is a carbon based fossil fuel.
Yes, coal is a fossil fuel.
Coal IS a fossil fuel
solar energy
They are called fossil fuels.