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10 cards from this deck
Dust & rocks sticking together to build early Earth
Gases released from magma as pressure decreases
Virtually none (no O₂)
No red sedimentary rocks before 2 billion yrs ago
Produced O₂ from CO₂ using sunlight
97%
Liquid water to vapour using solar energy
Water falling as rain or snow
Input rate equals removal rate
Avg. time substance stays in ocean before removal
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