A nail may be considered as an achiral object because it can
be superimposed when it is faced in a mirror image where in it may look exactly
the same rather than chiral when they are in a mirror image, it wouldn’t be
superimposable.
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The borders (coastlines) of the continents underwent a number of changes
since the split. Often, chunks of land were washed away with water,
slowly or in bigger portions. The coast was generally "smoothed" by the
ocean currents too, and in some places more land was added with the
material that the ocean currents brought.
Then, the tectonic plates continue to move, so this adds to the changes of the shape of the continents.