The lithosphere is broken up into several large pieces called crustal plates. These plates float on the denser semi-molten rock beneath them and move very slowly across the surface of the earth. Each plate move approximately 2cm per year interacting with each other in different directions.
The plates can move towards each other, away from each other as well as pass each other. The area where the edges of two plates meet is called a plate boundary or a plate margin.
There are three types of plate boundaries.
1. Where two plates are moving towards each other (converging), it is called a convergent plate boundary.
2. When two plates are moving away from each other (diverge), it is called a divergent plate boundary.
3. When two plates move past each other, it is called a transform plate boundary.
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