"island arc" meaning in English

{
  "forms": [
    {
      "form": "island arcs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "island arc (plural island arcs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Geology",
          "orig": "en:Geology",
          "parents": [
            "Earth sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2012, Chinle Miller, “The Tectonic Forces of the Mesozoic”, in In Mesozoic Lands: The Mesozoic Geology of Arches and Canyonlands National Parks, Kindle edition, page 34",
          "text": "Offshore to the west of the continental margin during the Early Triassic, the Sonoma highlands formed a volcanic island arc, separated from the mainland by a shallow sea that cut through western Nevada and northwestern Utah.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A long chain of active volcanoes with intense seismic activity found along convergent tectonic plate boundaries."
      ],
      "id": "en-island_arc-en-noun-wFAfzzYX",
      "links": [
        [
          "geology",
          "geology"
        ],
        [
          "active volcano",
          "active volcano"
        ],
        [
          "seismic",
          "seismic"
        ],
        [
          "activity",
          "activity"
        ],
        [
          "convergent",
          "convergent"
        ],
        [
          "tectonic plate",
          "tectonic plate"
        ]
      ],
      "raw_glosses": [
        "(geology) A long chain of active volcanoes with intense seismic activity found along convergent tectonic plate boundaries."
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ]
    }
  ],
  "word": "island arc"
}

{
  "forms": [
    {
      "form": "island arcs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "island arc (plural island arcs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "en:Geology"
      ],
      "examples": [
        {
          "ref": "2012, Chinle Miller, “The Tectonic Forces of the Mesozoic”, in In Mesozoic Lands: The Mesozoic Geology of Arches and Canyonlands National Parks, Kindle edition, page 34",
          "text": "Offshore to the west of the continental margin during the Early Triassic, the Sonoma highlands formed a volcanic island arc, separated from the mainland by a shallow sea that cut through western Nevada and northwestern Utah.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A long chain of active volcanoes with intense seismic activity found along convergent tectonic plate boundaries."
      ],
      "links": [
        [
          "geology",
          "geology"
        ],
        [
          "active volcano",
          "active volcano"
        ],
        [
          "seismic",
          "seismic"
        ],
        [
          "activity",
          "activity"
        ],
        [
          "convergent",
          "convergent"
        ],
        [
          "tectonic plate",
          "tectonic plate"
        ]
      ],
      "raw_glosses": [
        "(geology) A long chain of active volcanoes with intense seismic activity found along convergent tectonic plate boundaries."
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ]
    }
  ],
  "word": "island arc"
}