Question

formation of coal...........​

Answer 1

Answer:

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 when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years.[2] Vast deposits of coal originate in former wetlands—called coal forests—that covered much of the Earth's tropical land areas during the late Carboniferous (Pennsylvanian) and Permian times.[3][4] However, many significant coal deposits are younger than this and originate from the Mesozoic and Cenozoic eras.

Explanation:

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Answer 2

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Coal was formed some 300 million years ago, when trees and plants in the forests got buried under the earth's surface as a result of earthquakes, cyclones, and other natural disasters. There are hot conditions, absence of air; as a result hydrogen and oxygen were removed from wood, leaving behind carbon. Due to high temperature and high pressure, the carbon changed into a stone-like residue called coal.

This slow process of changing of wood into coal by numerous heating and pressure inside the earth's surface is called carbonisation.