The three types of plate movement are divergent, convergent and transform plate boundaries. Divergent occurs when two tectonic plates move away from the other. A convergent boundary is when two plates collide. A transform plate boundary occurs when two plates slide past each other.
The scientific theory that explains the movement of the plates of the Earth's crust is the theory of plate tectonics. This theory was developed in the 1960s. It describes the movement, as well as the cause of earthquakes, volcanoes, trenches in the ocean and mountain ranges. These geographical activities occur where the tectonic plates have contact.