Convergent (or destructive): Where two plates are moving toward each other. Collisions between oceanic plates results in subduction of the more dense plate. Collisions between an oceanic plate and a continental plate may result in the subduction of the oceanic plate because oceanic plates are more dense than continental plates. Collisions between two continental plates results in uplift and mountain formation where neither plate subducts.
Divergent (or constructive): Where two plates are moving away from each other. Divergent plate boundaries are the site of new crust formation, particularly at the mid-ocean ridges, where spreading plates are infilled with basaltic magma from the asthenosphere.
Transform (or conservative): Where two plates slide (actually 'grind') alongside each other and neither plate subducts. Earthquakes are common at transform faults due to the grinding and snapping movements of the plates as they move.
1/ Convergent, or colliding:-where the plates are moving towards each other. Example : Nazca plate colliding with west coast of South America produces the Andes mountain range. 2/ Divergent, or...