Oceanic Continental Plate ConvergenceWhen an oceanic plate collides with a continental plate the crust forming the oceanic plate gets bent and pulled under the continental crust. This is because the rocks that form the oceanic crust are denser and thinner than the rocks that form the continental crust. The process by which 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. At the subduction zone where the oceanic crust sinks beneath the continental crust a deep oceanic trench or valley is created. These can be many of thousands of kilometres long and 8 to ! kilometres deep making them the deepest part of the ocean "oor.The deepest place on #arth is called the $hallenger %eep. &t is found in theMariana Trench-TheMariana TrenchorMarianas Trenchis the deepest part of the world(s oceans. &t is located in the western )aci*c +cean, to the east of the -ariana &slands. The trench is about .,//! kilometres 0,/8! mi1 long but has an average width of only 23 kilometres 045 mi1.+ceanic and continental plate collisions result in mountain and volcano formation. -ountains are formed as the overriding continental plate gets lifted up over the oceanic plate. An e6ample of this is found at the boundary between the South American continental plate and the 7azca oceanic plate. The South American continental plate is being lifted over the subducted 7azca oceanic plate creating the Andes mountain range.The formation of volcanoes is a result of the subduction of the oceanic crust. As the oceanic crust gets forced deeper into the #arth the increasing heat and pressure releases trapped water and gases, the combing e8ect of which is the crust melting to form magma. This magma rises and accumulates in magma chambers which then feeds and creates volcanoes on the overriding continental plate.#arth9uakes are also common at oceanic and continental plate boundaries. These occur when the deepest part of the subducting oceanic plate break into smaller pieces. Some of the pieces become locked in place for long periods and when they are suddenly released they generate large earth9uakes.