Jisho

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Noun
1. submarine volcano
Wikipedia definition
2. Submarine volcanoSubmarine volcanoes are underwater fissures in the Earth's surface from which magma can erupt. They are estimated to account for 75% of annual magma output. The vast majority are located near areas of tectonic plate movement, known as ocean ridges. Although most are located in the depths of seas and oceans, some also exist in shallow water, which can spew material into the air during an eruption.
Read “Submarine volcano” on English Wikipedia
Read “海底火山” on Japanese Wikipedia
Read “Submarine volcano” on DBpedia

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