火山係岩漿穿地殼嗰開口,有滴會係爆開嗰。箇隻開口拕岩漿,即係熱熔吥嗰石,連帶灰同氣體一齊由地底走上地面。火山活動,通常同造山時期有關。
火山通常到板塊拉開或者推埋嗰地方。但亦有一滴地方地殼薄而爆開。
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