Crude Oil

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

Clues

  • Breaking down large hydrocarbons into small ones (8)
  • How easily it burns (12)
  • Poisonous gas (6, 8)
  • Short-chain hydrocarbons and low boiling point alkanes, used as a fuel (9, 3)
  • Tall tower where fractioning happens (11, 6)
  • The hydrocarbons are cracked when this takes place (7, 13)
  • The size of the molecule depends on its... (7, 5)
  • The tendency to turn into a gas (10)
  • Used as fuel in diesel engines and as boiler fuel (6, 3)
  • Used for fuel in car engines (8, 6)

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