Global Origins
I. Atmosphere
     A. Formation
          1. Volcanic Outgassing
          2. Impact Degassing
     B. Composition
          1. Carbon Dioxide
          2. Free oxygen virtually nonexistent

II. Oceans
     A. Formation
     B. Composition

III. Origin of Life
     A. Miller-Urey Experiment
     B. RNA World
     C. Interplanetary Dust Particles (IDPs)
     D. Hydrothermal vents
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