When matching up once-joined continents such as South America and Africa, the coastlines do not fit together as nicely as the continental shelves. Why might this be the case?

Explanation:

The continental shelves are nothing but edges of the continents. Whereas the shorelines are simply an indicator of where the sea level is in relation with the topography of the place. Therefore, the coastlines do not fit together as nicely as the continental shelves.

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