十万个为什么·科学阅读30篇（5）
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How Do Geysers Shoot Hot Water Into the Air?
间歇泉是如何把热水喷向空中的？
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Geysers form when underground water meets hot rocks near magma.间歇泉形成于地下水遇到岩浆附近炽热岩石时。
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Water heats up and turns into steam under high pressure.水在高压下受热变成蒸汽。
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Steam builds until pressure forces water and steam upward.蒸汽不断积聚，直至压力将水和蒸汽向上推。
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This sudden release causes the geyser to erupt violently.这种突然释放导致间歇泉剧烈喷发。
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Old Faithful in Yellowstone erupts every 60–110 minutes.黄石公园的老忠实间歇泉每60至110分钟喷发一次。
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Not all hot springs are geysers—only those with narrow underground channels.并非所有温泉都是间歇泉——只有具备狭窄地下通道的才是。
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Eruptions stop when water runs low or channels shift.当水量减少或通道移位时，喷发便会停止。
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Geologists map geyser systems to understand volcanic activity below.地质学家测绘间歇泉系统以了解其下方的火山活动。