Solid fuel: coal, wood Liquid fuel: kerosine, gasoline Gas fuel: methane, hydrogen
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Coal is a fossil fuel found in solid rock form that is obtained through mining. It is formed from the remains of plants that lived millions of years ago and is a major source of energy worldwide.
Coal is the solid fossil fuel formed from the remains of swamp plants that grew millions of years ago.
Coal is a solid fossil fuel. It forms from the remains of plants that lived and died millions of years ago, and it is mined for energy production.
Coal is a solid fossil fuel that is formed from the remains of plants that have been subjected to heat and pressure over millions of years.
It is coal.