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Formation of the Atmosphere: Asteroids and Meteorites Probably contained water and then this vaporized when it impacted forming a hazy type of atmosphere.

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Presentation on theme: "Formation of the Atmosphere: Asteroids and Meteorites Probably contained water and then this vaporized when it impacted forming a hazy type of atmosphere."— Presentation transcript:

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2 Formation of the Atmosphere: Asteroids and Meteorites Probably contained water and then this vaporized when it impacted forming a hazy type of atmosphere.

3 Formation of Atmosphere: Volcanic gases Volcanoes gases such as CO2, water vapor, etc. This process is called OUTGASSING

4 Formation of Atmosphere: Cyanobacteria = Photosynthetic bacteria. Pull CO2 out of atmosphere and replace it with oxygen. During Achean (Began to combine to form stromatolites during Proterozoic)

5 Evidence of Oxygen: Evidence in ROCKS Iron in Archean Rocks oxidized (rust) with the new O 2 in the “atmosphere” Left these rusted bands in the rocks

6 Formation of atmosphere: Evidence … Current atmosphere contains ozone (O3) which prevents UV from killing life on earth. Since life began to thrive, Oxygen must have been present.

7 Formation of Oceans Water vapor dropped from the atmosphere. Dissolved minerals on the surface of the land which accumulated in oceans making them salty.


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