Constructive / Tensional (divergent ) Plate Boundary . Volcanic arcs can form as island arc chains or as arcs on continental crust. There are four main types of plate boundary. As a result of pressure, friction, and plate material melting in the mantle, earthquakes andvolcanoes are common near convergent boundaries. Normally the older plate will subduct because of its higher density. Here the Nazca Plate is subducting beneath the South American plate.Effects of a convergent boundary between an oceanic and continental plate include: a zone of earthquake activity that is shallow along the continent margin but deepens beneath the continent; sometimes an ocean trench immediately off shore of the continent; a line of volcanic eruptions a few hundred miles inland from the shoreline; destruction of oceanic lithosphere.When a convergent boundary occurs between two oceanic plates, one of those plates will subduct beneath the other. Convergent plate boundaries are locations where lithospheric plates are moving towards one another. The Cascade Mountain Range is a line of volcanoes above the melting oceanic plate. This deformation can extend hundreds of miles into the plate interior.The Himalaya Mountain Range is the best active example of this type of plate boundary. If the two plates are of equal density, they usually push up … With continued development the islands grow larger, merge, and an elongate landmass is created.Japan, the Aleutian Islands, and the Eastern Caribbean islands of Martinique, St. Lucia, and St. Vincent and the Grenadines are examples of islands formed through this type of plate boundary. The intense compression can also cause extensive folding and faulting of rocks within the two colliding plates. The Andes Mountain Range of western South America is another example of a convergent boundary between an oceanic and continental plate. The Plate tectonics is driven by convection cells in the mantle.

Convection cells are the result of heat generated by radioactive decay of elements in the mantle escaping to the surface and the return of cool materials from the surface to the mantle.Subduction zones are areas where one lithospheric plate slides beneath another at a convergent boundary due to lithospheric density differences. Normally the older plate will subduct because of its higher density. Partial melt will travel up through the asthenosphere, eventually, reach the surface, and form volcanic island arcs.

When oceanic lithosphere and continental lithosphere collide, the dense oceanic lithosphere subducts beneath the less dense continental lithosphere. A small portion of the continental crust may be subducted until the slab breaks, allowing the oceanic lithosphere to continue subducting, hot asthenosphere to rise and fill the void, and rebound of the continental lithosphere.The oceanic crust contains hydrated minerals such as the amphibole group.

As the oceanic lithosphere subducts to greater depths, the attached continental crust is pulled closer to the subduction zone.

The plate collisions that occur in these areas can produce earthquakes, volcanic activity, and crustal deformation.When continental and oceanic plates collide, the thinner and more dense oceanic plate is overridden by the thicker and less dense continental plate. Visit the Effects that are found at this type of plate boundary include: a zone of progressively deeper earthquakes; an oceanic trench; a chain of volcanic islands; the destruction of oceanic lithosphere.This is a difficult boundary to draw.

The oceanic plate is forced down into the mantle in a process known as "subduction." These are constructive, destructive, conservative and collision margins. An accretionary wedge forms on the continental crust as deep-sea sediments and oceanic crust are scraped from the oceanic plate. A convergent boundary is an area on Earth where two or more lithospheric plates collide.

In the early stages of this type of boundary, the cones will be deep beneath the ocean surface but later grow to be higher than sea level. Volcanic arcs form on continental lithosphere as the result of partial melting due to dehydration of the hydrous minerals of the subducting slab.

At a depth of about 100 miles (160 km), materials in the subducting plate begin to approach their melting temperatures and a process of partial melting begins.The Washington-Oregon coastline of the United States is an example of this type of convergent plate boundary. Magma chambers that reach the surface break through to form a volcanic eruption cone. First it is complex and second, it is poorly understood when compared to the other types of plate boundaries. These plates dip at an average of 45° but can vary. A tectonic boundary where two plates are moving toward each other. Magma chambers are produced as a result of this melting, and the magma is lower in density than the surrounding rock material. During subduction, oceanic lithosphere is heated and metamorphosed causing dehydration of these hydrous minerals contained within basalts, releasing water into the asthenosphere. The subducting plate is heated as it is forced deeper into the mantle, and at a depth of about 100 miles (150 km) the plate begins to melt.

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