Coal

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B A H Y D R A U L I C J A C K S Y W V B
T I T R U X S C Q J Y E J N S N A Q Q K
W S C A V B N R J F W G A D J H G O X N
P I M X H F A Y S H E S B Q W F T L K H
K F G U C N N M G D J M Y T L G U T E W
G A X N T R A P T A T B X V V B L V U H
G O G S B E E G V R X V F C L Y U W G L
C G C B T J R D V J B C N U C I I M E W
R U R Y E F O Q P R T S S O Q F D E H L
K B A F W F B G M F F B I K Q B M O W W
Q D L S D U I H G B S M I A B B O B Y B
O N L Q D D C S V R E B V N J S F C P N
H A I U A T X Q B B R D K W U O N G F P
B V P Q A F H V M R F A Q L W H E F G Y
F X W V D N T W R W C I J T N S C G W U
C N D E C S Y E A W N R C D Q I T D F I
O S P V G F K S K J E L D S I W L C R G
P S T E E L H O O P S B P B F F V C W Y
X G U E Q P F R B Y N S L A T L R B A Q
D J Y I N H D A S K Q I X M B T D D Y X

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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