Question

how was coal formed​

Answer 1

The formation of coal begins in areas of swampy wetlands where groundwater is near or slightly above the topsoil.

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Answer 2

Coal is a hard rock which can be burned as a solid fossil fuel, it is a sedimentary rock formed from peat, by the pressure of rocks laid down later on top. Also wood heated in an airless space can make charcoal, which is like coal.