Question

a) How is coal formed in nature?
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Answer 1

Answer:

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.

Explanation:

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Answer 2

Answer:

Coal formed millions of years ago when the earth was covered with huge swampy forests where plants - giant ferns, reeds and mosses grew. Heat and pressure produced chemical and physical changes in the plant layers which forced out oxygen and left rich carbon deposits.