11.   It is indeed interesting to note that the highest passive margins also seem to be those characterized by rift-related volcanism, just as the model predicts.

12.   Moreover, if we compare opposing passive margins there seem to be a number of cases where their morphology and structure are very different.

13.   Such detachment models predict that two types of passive margin will be produced by continental rupture.

14.   The modelling of passive margin evolution is still in its infancy.

15.   New ocean basins are created which become wider through time but eventually subduction zones will become established, either along previously passive margins, or within ocean basins.