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Card 6
Front
What happened as the Earth cooled?
Back
Card 7
Front
What happened in the next two billion years?
Back
Card 8
Front
How did algae and plants change the Earth's atmosphere?
Back
Card 9
Front
Where did most of the carbon dioxide, nitrogen and water vapour in the Earth's early atmosphere come from?
Back
Card 10
Front
What produced the oxygen in the atmosphere?
Back
Card 11
Front
**TRY TO MEMORISE THE MAIN GASES THAT WERE PROBABLY IN THE EARTH'S EARLY ATMOSPHERE**
Back
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