Key Terms – Ch 3

Geography
atmospheric composition
N2 (78%)
O2 (21%)
Ar (1%)
CO2 (<1%)
Also
He, Ne, H2, CH4, Kr, Xe
evolution
ocean–> proteins–> photosynthesis–> O2–> ozone–> humans
free oxygen
uncombined oxygen available for metabolic processes
anaerobic photosynthesizers
oxygen and sugar production without oxygen in the environment
aerobic photosynthesizers
oxygen and sugar production with oxygen in the environment
ozone
O3 or the layer of O3 above the troposphere
UV radiation
a form of electromagnetic radiation
stratosphere
layer above the troposphere
CFCs
chlorofluorocarbons; deplete ozone layer
anthropogenic
created by humans
enhanced greenhouse effect
the increase in the natural greenhouse effect resulting from increases in atmospheric concentrations of GHGs due to emissions from human activities
global warming
steady increase in overall global temperatures

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