Coal 0.0 / 5 ? GeologyCoal and Coal MiningA2/A-levelOCR Created by: HannahCavielCreated on: 23-02-17 12:52 42531 Across 1. the stacks of coal left behind in the underground mine: pillar or stall? (6) 4. what supports the roof of a working face (9, 5) 5. what material is used to support the tunnel roofs in longwall mining (5, 5) Down 2. is the environment needed for coal to be formed anaerobic or aerobic (9) 3. what is the name of the collapsed coal in longwall mining? (4)
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