What determines the temperature of a layer of the atmosphere?
A. The way the layer interacts with the layer below it
B. The altitude of the solar radiation
C. The average wind speed in the layer
D. The way the layer interacts with solar radiation

The critical mass of a fissionable material depends upon its nuclear properties (specifically, the nuclear fission cross-section), its density, its shape, its enrichment, its purity, its temperature and its surroundings.
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