ENV200H1 Lecture Notes - Lecture 6: Nitrogen Fixation, Nitrogen Cycle, Nitrification

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28 Apr 2013
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Could a carbon atom of 1000"s years ago be the same carbon atom u have today in your body; yes **** Involves biological, geological and chemical interactions: matter cycles through ecosystems, one ecosystem to another; one organism to another. Nitrogen cycle: proteins dna, atmosphere is 78% n2, five steps. Influenced by human activities: 78% of nitrogen is in the atmosphere. Its one chemical that has been influenced by human activities. Back in the 20th century of industrial process there was a process to convert atmospheric nitrogen into the more biological usable form. As result we have unlimited supply of ammonia for crop production ex: artificial fertilizers: projected that nitrogen deposition on earth"s surface will double within next 25 yrs. Eutrophication, water quality, smog, acid rain, greenhouse gases. Nitrogen fixation: specialized bacteria, split atmospheric nitrogen and combine it with hydrogen. 4 layers of the atmosphere: troposphere, stratosphere, mesosphere thermosphere. Composition of the atmosphere, hydrosphere (oceans), lithosphere(solid grounds)

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