Lance Allen wrote:

> But then again this might be another trick question????????

  Yes, in this respect it *is* a bit of a "trick" question.  The Oxygen
in the atmosphere absorbs the UV, being converted to Ozone in the
process.  The Ozone may absorb more UV again but I'm not sure how it
then releases the energy.

  Anyway, Ozone is an *indicator* of UV absorption by Oxygen.
--
  Cheers,
        Paul B.