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                                    What are factors determining the different types of coal | 
                            
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Answer»  The rank of a COAL deposit is determined by the amount of pressure and heat that acted on the plants over time. ANTHRACITE CONTAINS 86%–97% carbon and generally has the highest heating value of all ranks of coal. Anthracite accounted for less than 1% of the coal MINED in the United States in 2019. 
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