• Noble gas data indicate that  > 80% of the atmosphere was formed extremely early in Earth history
• much of this atmosphere was lost again in the first 100 million years
• this suggest that initially the atmosphere was far denser and more massive than today
• this would have had an insulating effect leading to a build up of temperature
• facilitating the formation of magma oceans and core formation.

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I am going to encourage you a little, to help you get started :)
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