Earth System Science

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

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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