Senin, 07 November 2011

Thunder

The reason why lightning is always accompanied by thunder is because the thunder is caused by the bolt of electricity produced in a lightning strike. The deep rumbling and sharp cracks of thunder are produced as the air around the lightning bolt is super heated — up to 60,000 degrees Fahrenheit (33,315 C) — and rapidly expands. It creates a shock wave which manifests itself as thunder. The closer the lightning is, the louder the clap of thunder will be. 

thunder  of  toronto


Before science could provide an explanation based on scientific data in the 20th century, the cause of thundermythology is named for the Old Norse word for thunder, and is nearly always portrayed wielding a thunder clapping hammer. was undetermined, and a matter of much dispute. Early Greeks believed it was caused by clouds colliding. Other theories include vacuums, exploding gases and steam. Thor, a god of Norse
Over 100,000 thunderstorms are recorded every year but only a small percentage are considered “severe” by the National Weather Service. Thunderstorms are capable of producing dangerous lightning, tornadoes, strong winds, hail and heavy rain, which can lead to flash flooding. Although thunder can be frightening for some, and a few people actually suffer from astraphobia, the fear of thunder, it is helpful to regard it as a warning that lightning is near.

http://www.wisegeek.com

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