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.
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Molten rock, gas, and ash build up underground.
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Pressure grows as more magma rises from deep inside.
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When pressure becomes too strong, it breaks through the surface.
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Hot lava flows out, and ash shoots high into the sky.
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Some eruptions are gentle; others are very powerful.
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Scientists watch volcanoes to warn people before eruptions.
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This helps keep communities safe from danger.