CompuServe Messages

Hi, Ed– The picture I am forming in my mind is of a great range of fold mountains (as big as the Himalayas?) forming during the collisions as/before Pangaea formed, with correspondingly great roots below them. Then, sort of like I explained to Kamron, as the tops wore down, the roots floated up correspondingly, perhaps keeping the general level always high. (I goofed in treating the roots as equal in depth to the mountains' height, momentarily forgetting the density difference between air and mountain is far greater than the difference between continental rock and mantle rock, thus should have made the roots deeper by a factor of 5 or 10, more like an iceberg). By now the mountains have apparently worn down below the original ground level, but differential wear on deeper folds from the collision keeps them mountainous. I wonder if they have worn down to the original cratons yet? I also wonder if I have this all right – the water gaps where rivers cut straight through these mountains, mentioned in other messages in this thread, are a bit annoying. –Doug