十万个为什么·科学阅读30篇（3）
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What Makes a Volcano Erupt?
火山喷发的原因是什么？
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Volcanoes are openings in Earth’s crust.火山是地球地壳上的开口。
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Molten rock, gas, and ash build up underground.地下积聚着熔岩、气体和火山灰。
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Pressure grows as more magma rises from deep inside.随着更多岩浆从地球深处上升，压力不断增大。
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When pressure becomes too strong, it breaks through the surface.当压力过大时，便会冲破地表。
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Hot lava flows out, and ash shoots high into the sky.炽热的熔岩涌出，火山灰直冲云霄。
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Some eruptions are gentle; others are very powerful.有些喷发温和，有些则威力巨大。
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Scientists watch volcanoes to warn people before eruptions.科学家监测火山，以便在喷发前向人们发出预警。
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This helps keep communities safe from danger.这有助于保护社区免受危险。