The Pangaea Theory suggests that yes, all of the continents were at one time fused. Over the course of time, the pieces of land we now know as the seven continents slowly drifted apart from eachother due to gravity, volcanic activity, and/or earthquakes.
Yes, as cafils44 said, Pangea is the supercontinent which spawned the seven continents of today. The given answer, however, is slightly incorrect–or, at least, slightly misleading. Gravity hasn’t any affect on the movement of the continents. Last I heard, scientist speculate that the movement of the continents has to do with convection currents in the asthenosphere, a layer of liquid rock under the Earth’s crust, and that this movement manifests itself in volcanic activity, earthquakes, and continental drift.
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