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。
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/4/4a/MtCleveland_ISS013-E-24184.jpg/640px-MtCleveland_ISS013-E-24184.jpg)
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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