火山
火山（粵拼：fo2 saan1）係岩漿穿地殼嘅開口，有啲會係爆開嘅。呢個開口畀岩漿，即係熱熔咗嘅石，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。
火山通常喺板塊拉開或者推埋嘅地方。但亦有一啲地方地殼薄而爆開。
如果個火山可以引發極大規模爆發，火山爆發指數(VEI)去到八級嘅話，就叫超級火山。
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