Question

what is known as coal?
and give me answer ​

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.

Answer 2

Answer:

Coal is formed from the remains of vegetation; therefore, it is also known as fossil fuel. When coal burns, it produces mainly carbon dioxide gas.

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