Earth System Science

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

Clues

  • 4.25 Ba- collision with Theia (planet-sized body) (9, 2, 4)
  • 4.54 Ba- volcanic outgassing formed the early atmosphere and contributed to the oceans but only contained trace oxygen which inhibited emergence of life (9, 2, 5)
  • Lovelock, The Earth is a self-regulating system, once we have organic life on Earth, that life creates a habitat that maintains life on Earth. (4, 10)
  • Natural process by which life arises from non-living matter (11)

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