Plate boundaries can be either divergent or convergent . Divergent plate boundaries exist when two plates are moving away from each other. Convergent plate boundaries exist when two plates come together.
Convergent boundaries can be transform, collision or subduction boundaries.
The San Andreas fault in California is such a transform plate boundary. The boundary between the Indian and Asian plates is such an example of a collision plate boundary. The Himalayans are believed to be the result of this collision. When two plates converge in such a way that a heavier plate slides beneath a lighter plate, the plate contact is described as subduction . This rim of the Pacific is often referred to as the Ring of Fire .