Here's why:
* Plate tectonics is the theory that explains how the Earth's outer layer (the lithosphere) is made up of large, rigid plates that move and interact with each other.
* These movements include continental drift (the slow movement of continents across the Earth's surface), seafloor spreading (the formation of new oceanic crust at mid-ocean ridges), and subduction (the process where one plate slides beneath another).
* These movements are responsible for a wide range of geological phenomena, including earthquakes, volcanic eruptions, mountain building, and the formation of ocean basins.
While other movements of the Earth, such as the rotation and revolution, are also significant, plate tectonics is the most encompassing term for the movements of the solid parts of the Earth.
