Question

a brief note on a coal​

Answer 1

Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulfur, oxygen, and nitrogen.[1] Coal is formed if dead plant matter decays into peat and over millions of years the heat and pressure of deep burial converts the peat into coal.[2]

As a fossil fuel burned for heat, coal supplies about a quarter of the world's primary energy and two-fifths of its electricity.[3] Some iron and steel making and other industrial processes burn coal.

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Answer 2

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