高一英语Unit Earthquakes 浙教.pptx

flood第1页/共17页typhoonearthquakevolcanodroughtnatural disasters第2页/共17页firesandstorm第3页/共17页 Have you gone through any natural disaster?What damage did it cause?Where?When?How serious?typhoon,drought,earthquake,volcano,floodSo it may cause great damage to a city which suffer from natural disaster.第4页/共17页Tangshan and San Francisco,Discussion:What might happen if there has been a big earthquake in these two cities?broad roadsbeautiful gardens tall buildingslarge population第5页/共17页People lose their homes.Many buildings are destroyed.第6页/共17页Roads get huge cracks.The bridges fall down.第7页/共17页Steam burst from holes in the ground.Water pipes are destroyed.The railway tracks are useless pieces of steel.第8页/共17页The whole city lies in ruins.第9页/共17页Can we avoid(避免)or reduce(减少)the damage?We can foretell(预测)earthquakes.How to foretell an earthquake?第10页/共17页What may happen before an earthquake?Lets look at some signs(前兆前兆).第11页/共17页signs(前兆前兆).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 well walls have deep cracks in them.第12页/共17页How does an earthquake happen?第13页/共17页 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 _.outsideplatesnorthwest5.3jumpfelt第14页/共17页HOMEWORK:Prepare for Reading.第15页/共17页第16页/共17页感谢您的观看。第17页/共17页