十万个为什么·科学阅读30篇（3）
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What Makes Lava Flow Like a River?
岩浆为什么能像河流一样流动？
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Lava is melted rock deep inside Earth, heated by pressure and radioactivity.
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When a volcano opens, pressure drops and gases push lava upward.
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Its flow speed depends on heat, gas content, and how runny the rock is.
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Hot, thin lava moves fast like water; cool, thick lava creeps slowly.
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Rivers of lava can burn forests but also create new land over time.
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Scientists measure lava temperature and slope to predict its path.
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Sometimes lava cools and hardens into smooth ropy shapes called pāhoehoe.
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Other times it forms rough, jagged blocks called ‘a‘ā — both from the same volcano.