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    				| 1. | What is the structure of coal | 
| Answer» ONG>Answer: Coal is a sedimentary rock composed PRINCIPALLY of two BASIC classes of materials: inorganic crystalline minerals and organic CARBONACEOUS macerals. The macerals form the combustible part of the coal and are, in turn, divided into THREE maceral groups—vitrinite, exinite (or liptinite), and inertinite. | |