COAL VEIN Crossword Clue
COAL VEIN Crossword Clue
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                    Crossword Puzzle Infos
                            
                                A coal vein is a layer of coal that is found underground. It is formed when sedimentary rocks are buried and subjected to high temperatures and pressures. The term 'SEAM' is used to describe a coal vein, as it is a thin layer of coal that runs through the rock.