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1. Lightning &
Thunder
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3. Thunder is the sound caused by
lightning. Depending on the
distance from and nature of the
lightning, it can range from a
sharp, loud crack to a long, low
rumble (brontide). The sudden
increase in pressure and
temperature from lightning
produces rapid expansion of the
air within and surrounding the
path of a lightning strike. In turn,
this expansion of air creates a
sonic shock wave, often referred
to as a "thunderclap" or "peal of
thunder". The study of thunder is
known as brontology.

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