na. 【矿】火山岩
[网络] 火成岩；火山岩黄铁矿型铜矿床

volcanic rocks的用法和样例：

例句

Basalt is the commonest volcanic rock.玄武岩是最普通的火山岩。
So eruption of volcanoes is one way of producing igneous rocks.那么火山喷发是形成火山岩的一种方式罗。

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