On Thu, 24 Sep 2009 08:39:54 +1000, David Hare-Scott wrote:


I take you are saying this is not a mistake. So please explain the
physics. How can the subsoil be maintained well below the average annual
temperature?

I think the temp is 15 deg celcius.

and to answer your question; evaporative cooling {:-).
Water moisuture evaporating?
yes, you are allowed to say bullshit

David