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Clues
- is the environment needed for coal to be formed anaerobic or aerobic (9)
- the stacks of coal left behind in the underground mine: pillar or stall? (6)
- what is the name of the collapsed coal in longwall mining? (4)
- what material is used to support the tunnel roofs in longwall mining (5, 5)
- what supports the roof of a working face (9, 5)
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