[Answer] coal:

Answer: a solid, hard black substance that burns and gives off heat. It is formed
from partly decayed vegetable matter under great pressure and heat in the
earth
coal:
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Coal Sedimentary rock Bituminous coal Composition Primary carbon Secondary hydrogen sulfur oxygen nitrogen Lignite (brown coal ) Anthracite (hard coal ) 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. Coal is formed when dead …
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Coal is black or brownish-black and has a composition that (including inherent moisture) consists of more than 50 percent by weight and more than 70 percent by volume of carbonaceous material. It is formed from plant remains that have been compacted hardened chemically altered and metamorphosed by heat and pressure over geologic time.
Coal is a combustible black or brownish-black sedimentary rock with a high amount of carbon and hydrocarbons. Coal is classified as a nonrenewable energy source because it takes millions of years to form. Coal contains the energy stored by plants that lived hundreds of millions of years ago in swampy forests.

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