The Types Of Tectonic Plate Interactions

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1. Using the diagram above, explain any 3 of the 6 types of tectonic plate interactions. Note: a larger version of this diagram is located in the CONTENT section of this lesson. 1. Convergent Boundary of two Oceanic Plates: When two oceanic plates collide, one of the plates is subducted under the other during the collision. At the subduction zone, a deep trench is formed in the ocean floor. Oceanic and oceanic plate convergence result in the formation of volcano chains. Over millions of years, the lava and debris from the volcanic eruptions pile up on the ocean floor until the volcano rises above sea level to form a volcanic island. These types of islands are usually formed as chains called island arcs (which run parallel to the trench). 2. Convergent Boundary of an Oceanic and Continental Plate: When an oceanic plate collides with a continental plate, the crust forming the oceanic plate gets bent and pulled under the continental crust (which is because the rocks that the oceanic crust is comprised of are thicker than the rocks that form the continental crust). The process where the oceanic crust is pulled under the continental crust is called subduction and the zone at which this occurs at the plate boundaries is called the subduction zone. It is at the subduction zone where the oceanic crust sinks beneath the continental crust, forming a deep oceanic trench. As well, oceanic and continental plate collisions can result in earthquakes, volcanoes and folded mountain

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