Download presentation
Presentation is loading. Please wait.
Published byGeraldine Richards Modified over 9 years ago
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.
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.