A tornado is a violently spinning column of air that can star to form during a thunderstorm,there are about 45000 a day worldwide. Of course,not all tornadoes bring about total destruction.The most destructive ones occur in India,Banglsdesh and "Tornado Alley" in the USA.The worst ever "twister" hit this area in March 1925, When a huge tornado travelled across Missouri, lllinois and indiana, killing 695 people and injuring a futher 2,027