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

Clues

  • What is the only by-product of a hydrogen fuel cell? (5)
  • What name do we give to any fuels made from plants and animal waste? (8)
  • What type of biofuel is used mainly in Brazil and the USA? (10)
  • Which cell uses chemical reactions to produce electricity? (15, 4)

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