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Lightning is caused by a sudden release of electrical energy
in a flash of current from the clouds to the ground (or sometimes
between the clouds in the air). This electrical energy is
caused by the same kind of interactions that result in
static electricity between you and your clothes, and lightning
is just like those little sparks you sometimes see when you
touch a door knob on a dry day. Except much bigger! Thunder
is the sound made by the lightning as it sends lots of energy
into that little path through the air. There are lots of
good books describing lightning - look under "Lightning" in the library!
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