On average,there are 800 tornadoes in the US each year,causing about 80 deaths and over 1,500 injuries.The worst tornado of all time occurred in 1925,affecting three US states:Missouri,Illinois and Indiana.By the time it ended,about 700 people had been killed and more than 2,000 had been injured.
What is a hurricane? Hurricanes are strong tropical(热带的)storms,and they usually occur in the southern Atlantic Ocean,the Caribbean Sea and the Gulf of Mexico.There are violent winds of 120 kilometres per hour or more,which cause huge waves,heavy rain and floods.There are on average six Atlantic hurricanes each year and they usually affect the east coast of the US from Texas to Maine.
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