Discussion
In the Koppen system, group B is defined by
Answer: D
Correct answer: aridity, on a variable threshold
Group B is the dry group, and its threshold is not a fixed rainfall figure: it depends on the mean annual temperature, because warmer air evaporates more, and on the seasonality of the rain, because summer rain is less effective than winter rain. A place can therefore be arid at 500 mm and humid at 300 mm depending on where and when the rain falls.
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