Answer:
According to plate tectonics theory, there are seven tectonic plates ( 7 continents) that are constantly moving, whereas continental drift theory claims that there was only a single piece of land when earth was formed.
Explanation:Plate tectonic theory predates continental drift theory. Previously, there was only one land mass known as Pangea, which later broke apart; the phenomenon of this landmass breaking is explained by plate tectonics theory.