The map above shows uv radiation levels in africa and the middle east. depletion of the ozone layer causes higher levels of uv radiation to reach the earth.
what conclusion can be drawn about the ozone layer over southern africa?
the ozone layer is changing.
the ozone layer is very thin.
the ozone layer is just fine.
the ozone layer is very thick.

The ozone layer is very thin, because the ozone layer helps keep UV radiation from bombarding the Earth. The thinker you get, the lower the UV index; the thinner you get, higher the UV Index. On the map, it shows southern Africa as purple, +9 UV, which means that the ozone layer is very thin and not much ozone is stopping the radiation from bombarding the surface.