Editing Volcano (section)

===Convergent plate boundaries===
{{Main|Convergent boundary}}

[[Subduction]] zones are places where two plates, usually an oceanic plate and a continental plate, collide. The oceanic plate subducts (dives beneath the continental plate), forming a deep ocean trench just offshore. In a process called [[flux melting]], water released from the subducting plate lowers the melting temperature of the overlying mantle wedge, thus creating [[magma]]. This magma tends to be extremely [[viscous]] because of its high [[silica]] content, so it often does not reach the surface but [[Igneous intrusion|cools and solidifies at depth]]. When it does reach the surface, however, a volcano is formed. Thus subduction zones are bordered by chains of volcanoes called [[volcanic arc]]s. Typical examples are the volcanoes in the Pacific [[Ring of Fire]], such as the [[Cascade Volcanoes]] or the [[Japanese Archipelago]], or the eastern islands of [[Indonesia]].{{sfn|Schmincke|2003|pp=18,113-126}}<ref name=dkp/>