book1unit4warmingup.ppt
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1、fireNatural Disastersfloodtyphoonsnow slide(雪崩雪崩)volcano(火山火山)mudflowsandstormTsunami(海啸)海啸)earthquakeHow much do you know about an earthquake?Many people diedPeople lost their homes Many things were destroyed.大家一起来欣赏一首为汶川地震创作的歌曲直到永远青海省玉树县2010年4月14日发生两次地震,最高震级7.1级Many people believe that“it is alway
2、s calm before a storm,”look carefully at the two photos.Now,imagine there has been a big earthquake.Describe what might happen to the objects in the photos.TangshanTangshan,HebeiJuly 28th,1976San Francisco1906年年,旧金山旧金山地震后街景地震后街景1906年年,地震后旧金山市地震后旧金山市区被扭曲的电车轨道区被扭曲的电车轨道 Tall buildings were destroyed.Ro
3、ads were cracked.People were injured.The city was in ruins.Do you know why an earthquake happens?Pacific plateAmerican plateEurasian plate Indian plateAfrican plateAntarctic plateSan FranciscoParagraph 4Pacific plate NorthSouthWestEastAmerican plateEarthquake HappensWhy do earthquakes happen?Scienti
4、sts explain that the outside of the earth is made of a number of different plates.At San Francisco the Pacific plate which is moving towards the northwest meets the North American plate.The Pacific Plate is moving very slowly at 5.3 centimeters a year.nSometimes these two plates stop and do not move
5、 for years.Then suddenly,they jump and an earthquake is felt.As a result of the movement of these plates,west America near the sea has always been a bad place for earthquakes.When the 1906 earthquake happened,the pacific plate jumped 5-6 metres to the north.Imagine your home begins to shake and you
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