The Earth's Atmosphere



Earth's Atmosphere

Composition: 78% N2 21% O2 0.9% Ar 0.03% CO2

The Layers

Troposphere = weather zone

Stratosphere = stable air, contains ozone layer

Thermosphere = increasing temperature

Ionosphere = high temperature zone creates ions

Exosphere = the outer most layer



A History of Our Atmosphere



Primary Atmosphere

accreted material: H, He, Methane, Ammonia, H2O

Secondary Atmosphere

outgassing: H2O, Methane, CO2, Sulfur Dioxide, Nitrogen gases

Final Component

biology: produced O2, O3





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