History of the Earth atmosphere
Storyboard Text
- Slide: 1
- Over 4.5 billion years ago Earths formed the initial atmosphere that the planet had was mostly composed of hydrogen and helium
- Gravity held on into heavier gases lighter gases escaped into space like hydrogen the first atmosphere consisted of about 55 Water vapor 15 carbon dioxide 15 nitrogen 15 ammonia and trace amounts of methane but no oxygen???
- Slide: 2
- Around 4 billion years ago earth endured many impacts after all that the surface cooled and water vapor condensed back
- since then the planets surface has remained below the boiling point of water most of gases in our atmosphere bond with minerals or dissolve in sea water but nitrogen is an inert gas it doesn't react with minerals or dissolve in water
- Slide: 3
- our second atmosphere was mostly nitrogen 20% carbon dioxide with lesser amount of volcanic gases how did oxygen develop well it appeared in our current atmosphere tiny blue green single celled photosynthetic organisms called cyanobacteria that thrived in the oceans through photosynthesis carbon dioxide was converted into oxygen
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