Thunder is the sound caused by lightning. Depending upon the distance from and nature of the lightning, it can range from a long, low rumble to a sudden, loud crack. The sudden increase in temperature and hence pressure caused by the lightning produces rapid expansion of the air in the path of a lightning bolt. In turn, this expansion of air creates a sonic shock wave, often referred to as a "thunderclap" or "peal of thunder". The scientific study of thunder is known as brontology and the irrational fear (phobia) of thunder is called brontophobia.
Thunder is the sound produced when lightning strikes, caused by the rapid expansion of air that results from the extreme heat of the lightning bolt. The sound can vary from a low rumble to a loud crack depending on how far away the lightning is and its characteristics.
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