Answer:
Coal that has the highest energy yield is anthracite. Also known as hard coal, it has a high carbon content approximately 98% and few impurities. This type of coal is mostly found in the eastern part of the USA, and small amounts can be found in South Africa, Australia, China and Canada.
The type of coal most common in the United States of America is Bituminous, this type of coal is used to generate electricity and make iron and steel. It is also called soft coal, it is a sedimentary rock formed through chemical and physical changes of the sediment rock as well as sub metamorphic compression of peat bog material.
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