高一英语Unit4 Earthquakes 浙教版 课件.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Earthquakes,Unit 4,Warming up,Pre-reading&Listening(,Wb,),flood,typhoon,earthquake,volcano,drought,natural disasters,fire,sandstorm,Have you gone through any natural disaster?What,damage,did it cause,?,Where?,When?,How,serious,?,typhoon,drought,earthquake,volcano,flood,So it may cause great damage to a city,which,suffer from,natural disaster.,Tangshan and San Francisco,Discussion:,What might happen if there has been a big earthquake in these two cities?,broad roads,beautiful gardens,tall buildings,large population,People lose their homes.,Many buildings are,destroyed,.,Roads get huge,crack,s.,The bridges fall down.,Steam,burst,from holes in the ground.,Water,pipe,s are destroyed.,The railway tracks are,useless,pieces of,steel,.,The whole city,lie,s,in ruins,.,Can we avoid(,避免,)or reduce(,减少,)the damage?,We can foretell(,预测,)earthquakes.,How to foretell an earthquake?,What may happen before an earthquake?Lets look at some,signs,(,前兆,).,signs,(,前兆,).,1.People see bright lights in the sky.,2.Animals are too nervous to eat.,3.Mice run out of the fields for places to hide.,Fish jump out of the,pond,.,4.The,wel,l walls have deep cracks in them.,How does an earthquake happen?,Why do earthquakes happen?Scientists explain that the _ of the earth is made of a number of different _.,At San Francisco,the Pacific plate which is moving towards the _meets the North American plate.The Pacific plate is moving very slowly at_ cm a year.Sometimes these two plates stop and do not move for years.Then suddenly,they _ and an earthquake is _.,outside,plates,northwest,5.3,jump,felt,HOMEWORK:,Prepare for Reading.,