CONVERGENT BOUNDARY: A subduction zone is formed at a Convergent Plate Boundary when one or both of the tectonic plates is composed of oceanic crust.
DIVERGENT BOUNDARY: A Divergent Boundary is a linear feature that exists between two tectonics plates that are moving away from each other.
TRANSFORM BOUNDARY: A Transform Boundary is a boundary that is created by the action of two tectonic plates that are sliding past each other in a sideways motion.