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  • 1. Guru Charan Kumar IB ESS 2013 ANSWERS (a) a simplified description of reality; designed to show the structure or workings of an object, system or concept; 2 (b) oceanic circulation/ice/human activity/land and terrestrial features; [1] for any two correct. 1 (c) nitrogen/oxygen/carbon dioxide/water vapour/methane/ozone/ other named trace gases; Four correct [2], three or two correct [1]. (d) (e) (f) solar inputs will be short wavelength, and radiation outputs will be long wavelength; pollutant emissions leading to photochemical smogs; increased global temperatures through burning fossil fuels; altering chemistry of precipitation through sulfur dioxide/SO2 and nitrogen oxide/NOx emissions; x depletion of stratospheric ozone increasing input of UV light; reducing rainfall through deforestation; 2 1 3 max strengths: it stresses the interactions (feedback) within the system; represents the complex atmosphere as a system with inputs, outputs and transfers; Accept other reasonable strengths. limitations: nature of the interactions is not really shown; some categories are too broad to be helpful e.g. atmospheric circulation; some interactions are not shown; relative importance of different parts of the system not shown; Answer must refer to both strengths and limitations for full marks. 4 max