What is coal composed of?

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. Hope this helps.

coal contains Carbon, hydrogen sulfur, oxygen and nitrogen.

Explanation:

We use it as a fuel in power plants.industrial furnaces.domestic cooking etc.

It is mostly used in huge boilers to make steam and used for electrical power generation

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.