What are the four types of coal and how are they used?

Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
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What are the four types of coal and how are they used? 

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Coal is formed from the organic matters like dead plants decays over millions of years. Carbon content in coal determines its energy content. The more time it takes to form, more compressed and the denser carbon content, the greater its energy content per unit time. There are four types of coal and these are : Bituminous, lignite, anthracite and subbituminous.

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