The current configuration of continents is by and large with the continental land masses widely separated.
This separation is such that if one looks at the fauna currently established on these separate continental islands they are all significantly different one form another.
These differences would indicate that there has been not transfer of species from one continental mass to another for considerable time. Each is an evolutionary 'island'.
However as one moves back in time, examining the fossils record present on these continents, it becomes apparent that in the past there were faunas present and common to all these land masses.
One must therefore surmise that these land masses were connected in the past and that therefore that continent must move.
