Why Does Lightning Flash?
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Ages 5–10 | Why does lightning suddenly flash? You're looking at the sky, and then lightning flashes across the clouds.
It's so bright! A second later, thunder rumbles and makes you jump.
If lightning is just light, why is it so loud?
And why does it only happen during storms?
It turns out something invisible builds up inside the cloud.
And when it can't stay separated anymore, it connects all at once.
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