Definition of island arc in English:

island arc

Line breaks: is¦land arc


  • A curved chain of volcanic islands located at a tectonic plate margin, typically with a deep ocean trench on the convex side.
    More example sentences
    • The basalt-chert succession points more probably to an island arc developed on oceanic crust.
    • One model predicts tectonic wedging of the Solomon island arc beneath the Ontong Java plateau.
    • These units originated as an oceanic plateau possibly formed atop an island arc before being accreted onto the Cordilleran orogen.

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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
(in science fiction) navigation in outer space