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

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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