C1.1

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

Clues

  • 0.04% CO2 (13)
  • 0.9% Ar (5)
  • 21% O2 (6)
  • 78% N2 (8)
  • Early earth could also have resembled this moon which 98% Nitrogen (5)
  • Early earth would likely resemble this planet mad eup mostly of carbon dioxide (5)
  • Oceans etc formed when the earth cooled. Water vapour in the air ............., and formed clouds/rain. (9)
  • There was no life on early earth. This meant no oxygen as there were no organisms/plants to ........... (15)
  • Volcanoes added CO2, water vapour and ........... to the early atmosphere. (7)
  • We can tell the early atmosphere had no oxygen in it because the ............... in the oldest rocks contained no oxygen. (13)

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