In essence, plate tectonics is a theory which describes the movement of crustal plates across earth's surface. The three plate movement includes: divergent plate boundary (two plates move apart from each other), convergent plate boudary(two plates move towards each other) and transform plate boundary(two plates pass each other). Examples of ecach plate movement includes: earthquakes (transform plate boundary), volcanic activities (divergent plate boundary) and mountains (convergent plate boundary). This is the end of the lesson, however, for persons who are interested in learning more about plate tectonics, there are two main categries of plate tectonics: oceanic and continental plates. These types of plates affect the formation of earthquakes, volcanic activities and mountains. There is a link at the bottom where students can do further research.