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Why Do Volcanoes Erupt at Certain Times?
火山为什么在特定时间喷发？
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Volcanoes erupt when pressure builds up inside Earth's crust.火山在地壳内部压力积聚时喷发。
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Magma rises slowly from deep hot rock layers below the surface.岩浆从地表下方炽热的深层岩石层缓慢上升。
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Gas bubbles grow as magma moves upward and pressure drops.岩浆上涌、压力降低时，气体气泡逐渐变大。
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When gas pressure becomes too high, it breaks open the volcano.当气体压力过高时，便会冲破火山口。
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Earthquakes nearby can also trigger eruptions by shaking magma chambers.附近的地震也可能通过震动岩浆房而触发喷发。
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Some volcanoes erupt regularly, like Old Faithful geyser in Yellowstone.有些火山会定期喷发，例如黄石公园的老忠实间歇泉。
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Others stay quiet for centuries before sudden powerful bursts.另一些火山则可能沉寂数百年，再突然猛烈爆发。
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Scientists monitor ground swelling and gas emissions to predict eruptions.科学家通过监测地面隆起和气体排放来预测喷发。