单词：volcanic arc
volcanic arc的用法和样例：
例句
- Most of the islands are part of a geologically unstable and volcanically active island arc.多数岛屿在地理上都是不稳定的火山活动岛弧。
- The epithermal silver deposit and the Kuruko silver deposit are distributed over volcanic arcs and island arcs.火山弧和岛弧控制了浅成低温热液型和黑矿型银矿床。
- The Ellsworth basin lay between the epicontinental basin and the marginal magmatic arc during the Devonian.除了上述两个沉积盆地外，在罗斯海两边却出露了火山岩，说明该地当时处于俯冲带附近的火山弧中。
- The epithermal silver deposit and the Kuruko silver deposit are distributed over volcanic arcs and island arcs.火山弧和岛弧控制了浅成低温热液型和黑矿型银矿床。
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