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.
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It happens inside storm clouds or between clouds and ground.
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Ice and water move fast in clouds.
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This builds up positive and negative charges.
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When the charge difference gets too big, lightning flashes.
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Light travels very fast, so we see it first.
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Thunder is the sound of hot air exploding.
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We hear thunder later because sound is slower.