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

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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