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- CO2
- CO2
- CO2
- The Earth started tostabilize and theatmosphere was mainlycarbon dioxide with smallamounts of other gases.
- The Earth was formed 4.5billion years ago and was amolten ball of rock.
- The surface was covered involcanoes which expelledgases and water vapour intothe atmosphere.
- Water vapour condensedinto liquid water andformed the oceans.
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