Feature of first atmosphere

• The first atmosphere was probably thick with water vapor, along with various compounds released by volcanic eruptions including;

  • Nitrogen and its oxides (N2)
  • Co2
  • Methane(CH4)
  • Ammonia(NH3)
  • Hydrogen(H2)
  • Little amount of O2

  That atmosphere then turned to be a reducing one.
• • Later Earth was cooled down and the water vapor condensed into the ocean. Much of the hydrogen escaped into the space.
  • Environmentally conditions of early earth favored the synthesis of organic molecules essential for origin of life were;

  1. Volcanic eruptions
  2. Lightning
  3. Extreme UV radiation
  4. Hydrothermal vents
  5. Alkaline vents and reducing atmosphere