BIO-1151 Chapter Notes - Chapter 4: Cloud Condensation Nuclei, Sea Level Rise, Main Source

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12 Apr 2017
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Introduction: the most critical environmental challenges facing the earth result from cycle disturbance, understanding the nature of biogeochemical cycles is necessary to be able to fully appreciate the nature of these problems and their potential solutions. Matter can be transformed from one state to another by changes in heat and/or pressure. Law of conservation of matter: matter can neither be created nor destroyed, only transformed from one form into another. Human activities speed up transference between cycles components: pollution problems result from human-induced accumulation in one or more components of a cycle. Phosphorus (p: macronutrient incorporated into many organic molecules, eessential for metabolic energy use, relatively rare in relation to biological demand; essential that it cycles efficiently between components. It has an atmospheric component and thus better recycling potential (it is rarely limiting) It has strong dependencies on microbial activity (changing sulphur into various forms) Chemotrophic bacteria convert nh3 and nh4 into nitrates (no3-) and nitrites (no2-: denitrification.

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