名词
中文翻译：火山活动
同义词：
['volcanic activity', 'volcanic eruption']
例句：
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1. Volcanism is anatural phenomenon that occurs when a volcano erupts.
火山活动是一种自然现象，当一座火山爆发时发生。
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2. Thestudy of volcanism has helped usunderstand the Earth's geological history.
研究火山活动有助于我们了解地球的地质历史。
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3. Volcanism is responsible for theformation of new land and oceanic crust.
火山活动负责形成新的陆地和海洋地壳。