Question

Why don't the present shapes of the continents

Answer 1

I think it is because the continents erode and it shapes them differently.

Answer 2

Why don't the present shapes of the continents fit??

Answer-
One reason is because the coastlines of land masses change over time. If you map the edges of the continental shelves, the fit is much better.Changes in sea level, erosion, and deposition of sediment call all change the shapes of coastlines. What fit together even better than the continents themselves are the continental shelves. These areas were once dry land but dropped below sea level as Pangaea broke up. Even these can become somewhat distorted by tectonic forces.


I hope this helps! :D