The theory of plate tectonics differs from a hypothesis regarding a certain aspect of plate movement because the theory explains a number of related observations.
According to plate tectonic theory, the earth's continents or plates are in constant motion in relation to each other while the hypothesis of continental drift does not provide any such explanation.
The theory of plate tectonics says that the outer layer of the earth is split into several continental plates that slide over each other. In this process, the old plate subsides into the mantle and a new plate emerges in the form of a crust.
On the other hand, the continental hypothesis suggests that a long time ago the earth was a single supercontinent called 'Pangaea'. It says that Pangaea broke apart into several pieces which are now called continents.
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