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12 questions from this quiz
About 200 million years
About 78%
About 21%
About 4.6 billion years ago
Carbon dioxide
CO2CO_2CO2, H2OH_2OH2O, CH4CH_4CH4, NH3NH_3NH3
Water vapour condensed as Earth cooled
It formed carbonates as sediment
From main gas to less than 1%
About 95%
Earth's ability to form oceans
Carbon dioxide and noble gases
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