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Unformatted text preview: Hydrogen & helium very light Current atmosphere is secondary Secondary Atmosphere formed from degassing of volcanoes Assumed to be similar to gases emitted by volcanoes today Water 50-60% CO2 24% SO2 13% CO, S2, Cl2, N2, H2, NH3, methane CH4 Modern atmosphere N2 78%, O2 21%, CO2 .03% Volcanic Outgassing Water - 50-60...
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- Fall '11