十万个为什么·科学阅读30篇（6）
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How Do Volcanoes Erupt?
火山是怎样喷发的？
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Earth’s inside is hot rock called magma.地球内部是炽热的岩浆。
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Magma rises because it is lighter than solid rock.岩浆因比固态岩石轻而上升。
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Gas builds up inside as pressure grows.气体积聚，压力不断增大。
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When pressure gets too high, magma breaks through.当压力过高时，岩浆就会冲破地表。
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Lava, ash and gas burst out fast.熔岩、火山灰和气体迅速喷出。
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Some eruptions are quiet; others explode loudly.有些喷发很平静，有些则剧烈爆炸。
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Volcanoes form near tectonic plate edges.火山多形成于板块边缘。
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New land can grow after lava cools and hardens.熔岩冷却硬化后可形成新陆地。