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