volcanic arc

noun
a curving chain of active volcanoes formed above a subduction zone and adjacent to a convergent plate boundary.
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American Heritage
Science Dictionary
volcanic arc   (vŏl-kān'ĭk, vôl-)  Pronunciation Key 
A curved chain of volcanoes in the overriding tectonic plate of a subduction zone. Volcanic arcs form as the result of rising magma formed by the melting of the downgoing plate. They are curved because of the curvature of the Earth. The Andes mountains form a volcanic arc. See also island arc.
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Example sentences
Research is focusing on some properties of the volcanic arc vent ecosystem and on the biology of several interesting species.
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