Paul then I suspected my animated plots, and decided to see if there are actually boundaries or **ridges** in these flux regions:

[Laplacian Ridge Filter](https://www.youtube.com/watch?v=nE71SZCb1Tk)


Therefore again I believe your statement is not generally true, I have a grossly incompetent view of the thermodynamics of the planet (please don't tell me to read some school books).

Dara