Question

how is coal useful to us ? describe briefly how it was formed.
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Answer 1

Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. ... Coal is formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years.

Answer 2

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Coal is primarily used as fuel to generate electric power in the United States. ... Certain types of coal can also be used for metallurgical processes, like forging steel, smelting metals, or even in smelting sands, which are used to cast metal. Finally, coal can be burned to provide heat for individual homes.

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Coal is formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years. ... As a fossil fuel burned for heat, coal supplies about a quarter of the world's primary energy and two-fifths of its electricity