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Unit 4 Earthquake Warming up,fire,Natural Disasters,flood,typhoon,snow slide (雪崩),volcano (火山),mudflow,sandstorm,Tsunami (海嘯）,earthquake,On May 12th, 2008 14:28 A big earthquake happened in WenChuan Sichuan !,Many people believe that “it is always 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.,Tangshan,Tangshan, Hebei,July 28th, 1976,San Francisco,1906年, 舊金山地震后街景,1906年, 地震后舊金山市區(qū)被扭曲的電車軌道,Tall buildings were destroyed.,Roads were cracked.,People were injured.,The city was in ruins.,Do you know why an earthquake happens?,,San Francisco,Pacific plate,American plate,Eurasian plate,India plate,African plate,Antarctic plate,Paragraph 4,?,Pacific plate,North,South,West,East,American plate,,,,Earthquake Happens,Homework,Surf the Internet to find more information about the Tang Shan earthquake and the San Francisco earthquake.,