There are three kind of tectonic plates movements or interaction which leads to major changes in the structure of earth.
a) Divergent movements: here plates move away from each other leading to formation of rift valley etch. These movements are considered to be constructive in nature
b) Convergent : Here plates move towards each other leading to destruction in the earth.
c) sometimes a little or limited movement of plates (either divergent or convergent) is also observed which is called as transformed movement.
i) When pacific and north american plates converted towards each other they results in formation of San Andreas fault.
Here from the west The Pacific Plate shown movement in northwest direction towards North American Plate, which is on the eastern side, resulting earthquakes and creation of San Andereas fault
ii) as a result of diverging plats "Mid atlantic Ridge is formed"
