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Wikipedia definition
1. Back-arc basinBack-arc basins are geologic features, submarine basins associated with island arcs and subduction zones. They are found at some convergent plate boundaries, presently concentrated in the Western Pacific ocean. Most of them result from tensional forces caused by oceanic trench rollback and the collapse of the edge of the continent. Back-arc basins were not predicted by plate tectonics theory, but they are consistent with this model for how the Earth loses heat.
Read “Back-arc basin” on English Wikipedia
Read “背弧海盆” on Japanese Wikipedia
Read “Back-arc basin” on DBpedia

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