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Subduction results in creation of oceanic trenches and mountain building. Volcanoes that occur along these boundaries, such as Mt. Saint Helens and Krakatau, are called subduction zone volcanoes. There are more volcanoes associated with subduction zones than any other type of tectonic boundary.

When many volcanoes form along a subduction fault, they are called volcanic arcs.

When two oceanic plates collide, the younger of the two plates, being less dense, will ride over the edge of the older plate. Oceanic plates grow more dense as they cool and move further away from the Mid-oceanic ridge. When oceanic plate collides with continental plate, the oceanic plate is subducted, creating regions such as the Cascadia subduction zone of northwestern North America.

See also

• List of Tectonic Plate Interactions
• Oceanic rift
• CollusionIn the study of economics, collusion takes place within an industry when rival companies cooperate for their mutual benefit. Collusion most often takes place within the market form of oligopoly, where the decision of a few firms to collude can significant
• ObductionObduction is the overthrusting of continental crust by oceanic crust or mantle rocks. Obduction occurs where a fragment of continental crust is caught in a subduction zone with resulting overthrusting of oceanic mafic and ultramafic rocks from the mantle