GEOL 1340 Lecture Notes - Lecture 7: Outgassing, Cyanobacteria, Stratopause
10 Sep 2016
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Document Summary
After 4. 57 billion years ago of h captured from solar nebula by earth"s gravity. As cooled, reactions released h gas and ch4 in atm. Water vapor cooled led to precipitation filling oceans. Heavier gases near surface and lightest gases (h2, he) escaped to space. Dissociation of water vapor to h and o with h escaping to space. O reacted with methane to form co2 and h2o. O reacted with ammonia to form n and water. 2 sources of o2 in early atm o o. Methane and ammonia converted to co2 and n. Expands in thickness from 8 km thick at poles to 18 km at equator. Has natural and human-generated gases, dust particles and chemicals. Upper layer of warm air traps pollutants in cooler air below. Results from interaction of sun and combustion products. Co, no, volatile organic compounds, particulate matter, lead.
