Coal is a black rock that is made from the remains of plants that lived millions of years ago.
It is a fossil fuel, which means that it was formed from the remains of living things.
Coal can be burned to produce heat, which can be used to generate electricity or to heat homes and businesses.
The power plant is coal-fired.
Noun:
Singular: coal.
Plural: coals.
Adjective:
Coal-fired: using coal as a fuel.
Verb:
Coal: to supply with coal.
The word "coal" comes from the Old English word "col", which also means "coal". The Old English word "col" is thought to come from the Proto-Germanic word kaulaz, which also means "coal".
What type of fuel is coal?
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