Question

Why do different types of coal havedifferent composition?

Answer 1

Coal is a sedimentary black or dark brown rock that varies in composition. Some types of coal burn hotter and cleaner, while others contain high moisture content and compounds that contribute to acid rain and other pollution when burned. 

Coals of varying composition are used as a combustible fossil fuel for generating electricity and producing steel around the world. It has been the fastest growing energy source worldwide in the 21st century, according to the International Energy Agency.