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课件网) Unit 4 Natural Disasters Video Time In this class, you will watch the video to know about tsunami; discuss how to help the people who have suffered from a tsunami; talk about the safety instructions about tsunami. Learning objectives What natural disaster is shown in the picture Tsunami What is a tsunami What causes it What is its damage Look through the picture and introduction Prediction Before You Watch Read the sentences about the formation and effects of tsunamis. Then match each sentence with the correct picture. A. Tectonic plates(地壳板块) push together. B. A series of waves expands in all directions. C. Whole sections of cities are destroyed. C A B While You Watch Task1: Decide whether the statements are true (T) or false (F). 1.There are few warning signs just before a tsunami hits. 2. A tsunami breaks just like an ordinary wave but is bigger. 3.Scientists at the Pacific Tsunami Warning Center monitor the earth’s movements 24 hours a day in order to track tsunami. T F T F T F While You Watch Check your answers 1. There are few warning signs just before a tsunami hits. T F Check your answers 2. A tsunami breaks just like an ordinary wave but is bigger. T F A tsunami wave doesn’t break like an ordinary wave. Check your answers 3.Scientists at the Pacific Tsunami Warning Center monitor the earth’s movements 24 hours a day in order to track tsunami. T F While You Watch Task2: Circle the correct word(s) in each sentence. 1. An earthquake occurs when plates below the earth’s surface push together/pull apart. 2. Tsunami waves deep at sea move fast and rise only a few/ hundreds of feet. 3. As these killer waves enter shallow waters, their speed is reduced/raised. 4. Most tsunami damage is caused when the waves come in from/move back out to the sea. Check your answers 1. An earthquake occurs when plates below the earth’s surface push together /pull apart. Check your answers 2. Tsunami waves deep at sea move fast and rise only a few/ hundreds of feet. Check your answers 3. As these killer waves enter shallow waters, their speed is reduced/raised. Check your answers 4. Most tsunami damage is caused when the waves come in from/move back out to the sea. After You Watch Task3: Work in pairs. Discuss the questions. 1.What have you learnt about tsunamis What is a tsunami What causes it What is its damage harbor wave a natural disaster tectonic plates undersea earthquakes After You Watch ① ③ ② its damage After You Watch 2.What kind of help do you think people who have suffered from a tsunami need Trouble and problem Way to help 1.People are injured. Medical team should be sent there. 2.Houses are damaged. Shelters should be built there. 3.Resouces are cut off. Food and water should be sent there. 4.People lost their loved ones. Emotional help should be given. After You Watch Task4:Work in groups. Discuss and present your ideas. What should we do when a tsunami hits Do you know some ... ...
