2020新人教版必修一英语unit 4 Video Time ppt课件（含视频）.ppt

1、 Watch the video to know about tsunami. To talk about the safety instructions about tsunami. Discuss on the relief work after tsunami. Tsunami waves can strike out of nowhere and cause a lot of destruction. Scientists study and track tsunamis in order to warn people and minimise deaths. Tsunami: Kil

2、ler waves What is tsunami? A tsunami is a series of ocean waves that sends surges (急剧上升急剧上升) of water, sometimes reaching heights of over 100 feet (30.5 meters), onto land. These walls of water can cause widespread destruction when they crash ashore. What Causes a Tsunami? These waves are caused by

3、large, undersea earthquakes at tectonic plate boundaries. When the ocean floor at a plate boundary rises or falls suddenly, it displaces the water above it and launches the rolling waves that will become a tsunami. It may also be caused by underwater landslides or volcanic eruptions. What should we

4、do when a tsunami hits? Do you know some safety instructions? If you hear tsunami warning, evacuate at once. Go as high and as far as you can at least to a spot 30 meters above sea level or 2 miles away. Take your emergency kit. Drop, cover, and hold on to protect yourself from the possible earthqua

5、ke. Avoid downed power lines and stay away from buildings and bridges from which heavy objects might fall during an aftershock. Read the sentences about the formation and effects of tsunamis. Then match each sentence with the correct picture. A. Tectonic plates push together. B. A series of waves ex

6、pands in all directions. C. Whole sections of cities are destroyed. 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 mo

7、nitor the earths movements 24 hours a day in order to track tsunami. Circle the correct word(s) in each sentence. 1. An earthquake occurs when plates below the earths 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 wav

8、es 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. What have you learnt about tsunamis? Ive learnt the damage and what indicates the happening of it. What kind of help do you think people who have suffered fr

9、om a tsunami need? I think after a tsunami, the survivors must need dry clothes to put on, shelters to stay in and food to eat, and some medical cares. Work in pairs. Discuss the questions. Lets watch another video about tsunami. Write a passage about how to help the people who have suffered from a tsunami.