"A volcanic arc is a chain of volcanic islands or volcanoes formed by plate tectonics as an oceanic tectonic plate subducts under another tectonic plate and produces magma. This article is a . You can help My English Wiki by expanding it."@en . . "A volcanic arc is a chain of volcanic islands or volcanoes formed by plate tectonics as an oceanic tectonic plate subducts under another tectonic plate and produces magma. This article is a . You can help My English Wiki by expanding it."@en . . . . "Volcanic arc"@en .