Question

What is coal?.......... ​

Answer 1

Explanation:

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. ... Some iron and steel making and other industrial processes burn coal.

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Answer 2

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. ... Some iron and steel making and other industrial processes burn coal.

Explanation:

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