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Oceanic-Continental Convergent Boundary By: Nathan Marzoli, Jeff Chagnon Aaron Phinney, Dan Kunath What is an Oceanic-Continental Convergent Boundary? A Oceanic-Continental Convergent Boundary is a type of convergent boundary. A convergent boundary occurs when two plates move towards each other. At this type of boundary, old rock is recycled as the oceanic plate is forced under the continental plate. Description of an OceanicContinental Convergent Boundary This type of boundary occurs when a more dense oceanic plate is moving towards a continent. This continent is made up of a continental plate. These two plates are moving towards each other. When they collide, the more dense oceanic plate sinks down below the continental plate. As it sinks down, it causes a series of earthquakes. At these types of boundaries, volcanic mountain arcs are formed when the two plates collide. Examples of these volcanic mountain arcs are the Cascade Mountains, of which Mount St. Helens is part of in Washington. Diagrams Convection Currents Convention currents occur when cooler magma sinks down below the surface, then rises back up to the surface as warmer magma. When the hot magma rises to the surface, it pulls the plates in the area with it. They then travel across the surface and sink when the magma cools, dragging the plates along with it. Geological Feature That Forms At This Boundary The Geological feature that forms at these types of boundaries would be volcanic mountain arcs. They rise up out of the continent as mountain ranges, but actually are volcanic and are known to spew out lava at any time. Two Locations On Earth Where This Type of Boundary Exists Where the Juan de Fuca plate plunges under the North American plate. This occurs along the coast of the North Western United States. Another location is where the Nazca plate sinks underneath the South American plate, which forms the Andes Mountain Range. Vocabulary Plate- One of thirteen different sections of the lithosphere that move about the surface of the asthenosphere. Lithosphere- The rigid outer layer of the earth, including the curst and uppermost mantle. Asthenosphere- A layer of hot, weak material located in the mantle between a depth of 100 and 350 kilometers. The rock within this zone is easily deformed. Mantle- The most voluminous layer of the earth located between the crust and core. Vocabulary (Continued) Converging Boundary- A boundary in which two plates move together, causing one of the slabs to be consumed into the mantle as it descends beneath an overriding plate. Crust- The very thin outer layer of the earth. The End