十万个为什么·科学阅读30篇(3)
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What Makes Thunder and Lightning?
雷声和闪电是怎么产生的?
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Lightning is a big spark of electricity.闪电是一道巨大的电火花。
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It happens inside storm clouds or between clouds and ground.它发生在雷暴云内部,或云与地面之间。
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Ice and water move fast in clouds.云中冰晶和水滴快速运动。
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This builds up positive and negative charges.这会积聚正电荷和负电荷。
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When the charge difference gets too big, lightning flashes.当电荷差异过大时,就会产生闪电。
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Light travels very fast, so we see it first.光传播极快,所以我们先看到闪电。
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Thunder is the sound of hot air exploding.雷声是高温空气爆炸产生的声音。
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We hear thunder later because sound is slower.我们后听到雷声,因为声音传播较慢。