Types of Plate Boundaries 3 types of plate boundaries Tectonic Plate Boundary: Where two tectonic plates meet. Divergent Boundary : the boundary between two tectonic plates that are moving away from each other. The plates are separating. New sea-floor forms at divergent boundaries. Example: Mid-Ocean Ridge Convergent Boundary: the boundary formed by the collision of two lithospheric plates (tectonic plates). 3 types: 1. Continental – Continental 2. Continental – Oceanic 3. Oceanic - Oceanic 1. Continental – Continental Collision They buckle and thicken which pushes the continental crust upward – Forms Mountains. 2. Continental – Oceanic Collision The denser oceanic crust sinks into the asthenosphere. This is called a subduction zone. Old ocean crust gets pushed into the asthenosphere where it is remelted and recycled. -Forms trenches and volcanoes 3. Oceanic – Oceanic Collision One of the plates with oceanic lithosphere is subducted, or sinks, under the other plate. -Forms trenches and volcanic island arcs Transform Boundary: The boundary between tectonic plates that are sliding past each other horizontally. The San Andres Fault in California is where the Pacific and North American plates are sliding past each other. Because tectonic plates have irregular edges, they grind and jerk as they slide which produces EARTHQUAKES!