U4P1Warmingup选编.ppt

Earthquakes Unit 4 fire Look at the pictures below and name these disasters if you know. typhoon / hurricane volcano eruption snow slide mudflow tornado sandstorm flood tsunami earthquake Which disaster may cause the worst damage? The earthquake. How much do you know about the earthquake? What is an earthquake? An earthquake is what happens when two plates (板块) of the earth suddenly slip past one another. Buildings fall down. What happens when there’s an earthquake? Roads, bridges and railways are destroyed. Many things lie in ruins. The supply of electricity and water is cut off. Many people are killed or injured. More people are left homeless. What happened on 12 May, 2008 ? A terrible earthquake struck Sichuan, China on May 12, 2008. More than 60,000 people lost their lives. Do you know some other serious earthquakes that happened before? Tangshan 唐山抗震纪念碑广场 唐山大地震三十周年后的新唐山 San Francisco San Francisco, USA April 18th, 1906 Say something about these two cities. What will happen before an earthquake? Tangshan is a beautiful city with gardens, wide roads. San Francisco is a city with tall buildings thickly standing on the earth. These two cities are famous for their earthquakes during a period of calm. So one should not trust situations that seem peaceful since bad things may happen. Do you know? What strange things do you think may happen before an earthquake? well wall mice pond ----There is often a great sound. -----Animals too nervous to eat. ----There are bright lights in the sky. ----A smelly gas may come out of the well. ----Water pipes may crack or burst. Strange things before an earthquake In the well In the farmyard In the sky In the city well water, cracks, smelly gas chickens, pigs, mice, fish bright lights, the sound of planes water pipes nervous to eat, run out, jump cracked and burst rose and fell, came out of well brick canal dam Animals, for example, cows, pigs, horses, and snakes, are too nervous. 震前动物有预兆，群测群防很重要。   牛羊骡马不进圈，猪不吃食狗乱