As many have been commenting on for centuries, the shapes of South America and Africa fit together, almost like a jigsaw puzzle. The shapes of the other continents do not fit as seamlessly together at first sight but by mapping the sea floor we are able to see the continental shelf (the true edges of a continent). By using the continental shelf boundaries the puzzle fits with the other continents as well. This evidence suggests that the continents were once all connected and have drifted apart.
As can be seen in the diagram, the continental shelf of the continents fits together snugly.
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