2014年秋《全优课堂》高中英语（配人教版，选修六）同步课件：Unit5.ppt

Unit 5　The power of nature ;你知道什么是龙卷风，什么是飓风吗？你知道它们的威力有多大吗？ The violence of nature What is a tornado? A tornado is a rotating(旋转的)column of air from a thunderstorm to the ground.The most violent have winds of more than 400 kilometres per hour.Almost all of them occur in the US，in the area from Texas in the southeast to South Dakota in the north.;Tornadoes can pick up cars，trains and even houses and put them down in the next street—or even in the next town.They can take the fur off the back of a cat and the feathers off a chicken.They can destroy houses，but leave the furniture inside exactly where it was.; 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. ; The worst hurricane disaster of all time occurred on the 8th September 1900 in Galveston，Texas.Winds of about 200 kilometres per hour and five-metre high waves hit the city.The disaster killed 6,000 people in a population of 37,000 and destroyed 3,600 buildings.; An extraordinary event This is a story about the 1900 Galveston hurricane. Charles Coghlan was a nineteenth-century Irish actor who went to live in Canada.He then moved to New York，where he became famous.By the late 1890s，he had moved to Galveston，where he died in 1899，a year before the hurricane struck.The cemetery where Coghlan was buried was destroyed by the hurricane and Coghlan’s coffin ended up in the sea. ; Eight years later