Composition of the Atmosphere

What is the earths atmosphere made up of today (in percentages)

• 78% Nitrogen

• 21% Oxygen

• 1% Other gases (including argon and water vapour)

• 0.04% Carbon Dioxide

What was the earths early atmosphere made up of

• 80% Carbon Dioxide

• 10% Nitrogen

• 9% Water Vapour

• 1% Other gases (including O2)

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