Describe what a plate boundary is and what occurs at this point.

问题五,请简述什么是板块边缘,并请说明在板块边缘会有什么现象发生.

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The site of this destruction is another kind of plate boundary: a subduction zone.

销毁旧岩石圈的地方形成另外一种板块边界: 一块潜没的区域.

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Pengxian deposit and the Masongling Formationformation are products of island arc volcanism in convergent plate boundary.

证据表明,马松岭组及其所赋存的铜矿床均为会聚性板块边界古火山岛弧的产物.

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