Discussion
Why does the ionosphere form layers rather than a uniform region?
Answer: B
Ionising radiation is strongest high up but there is little gas to ionise, while lower down there is plenty of gas but the radiation has been absorbed, so the production rate peaks at an intermediate height. Different wavelengths and different constituents peak at different heights, which gives the several layers. Gravitational separation does occur but is not the layer mechanism, and the layers are physically real. A product of two opposing trends peaking in between is the classic Chapman argument.
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