Mark the incorrect statement about ozone.

• A

  Ozone gas is continuously formed by the action of UV rays on molecular oxygen, and also degraded into molecular oxygen in the stratosphere.

• B

  The thickness of the ozone in a column of air from the ground to the top of the atmosphere is measured in terms of Dobson units (DU).

• C

  Although thinning of ozone is occurring widely in the stratosphere, its depletion is particularly marked over the Antarctic region.

• D

  UV radiation of wavelengths longer than UV-B, are almost completely absorbed by Earth’s atmosphere, given that the ozone layer is intact.