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10 cards from this deck
200 million years
First billion years of Earth's existence
Venus or Mars
Carbon dioxide (CO2\text{CO}_2CO2)
Very little to no oxygen
Water vapour (H2O\text{H}_2\text{O}H2O), methane (CH4\text{CH}_4CH4), ammonia (NH3\text{NH}_3NH3)
Volcanic activity
Millions of years
Oceans and seas
Released large amounts of gases into atmosphere
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