Hi Chris;

It's a hobby of mine. people like David are similar to cockroaches. If you ignore them they don't go away, they proliferate.

Then a lot of what goes on here is for the benefit of the lurkers, those who read but do not post. False notions unchallenged can spread to the detriment of all.

How can one determine cause and effect in convection cell - plate motion? And if motion causes cells, how did the motion start?

Roger