Earths atmosphere

Earths atmosphere - Nitrogen produced by organisms...

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The Earth’s Atmosphere 100’s of free ppt’s from www.pptpoint.com library
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4 billion years ago Now Volcanic activity Mainly carbon dioxide Some methane, ammonia and water vapour Water vapour condenses to form oceans Plants evolve 3 billion years ago Plants give out oxygen – atmosphere polluted by oxygen Carbon & carbon dioxide taken in by sedimentary rocks as carbonates and fossil fuels
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Unformatted text preview: Nitrogen produced by organisms including denitrifying bacteria Micro-organisms that cannot tolerate oxygen killed off 2 billion years ago Oxygen results in ozone layer Ozone layer filters out harmful ultra violet light 1 billion years ago This allows evolution of new organisms Atmosphere for the past 200 million years: 20% Oxygen Small amounts of other gases including water vapour, carbon dioxide, noble gases 80% Nitrogen...
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This note was uploaded on 11/09/2011 for the course CHEM 210 taught by Professor Wilson during the Fall '10 term at BYU.

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Earths atmosphere - Nitrogen produced by organisms...

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