Video Time课件 高一上学期英语人教版(2019)必修第一册.pptx
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1、Unit 4,UNIT 4 NATURAL DISASTERS,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
2、minimize deaths.,Tsunami: Killer waves,What is tsunami?Atsunamiis a series of ocean waves that sends surges (急剧上升) of water, sometimes reaching heights of over 100 feet (30.5 meters), onto land. These walls of water can cause widespreaddestructionwhen they crash ashore.,What Causes a Tsunami?These w
3、aves are caused by large, undersea earthquakes attectonic 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 eruption
4、s.,What should we 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 youremergency kit. Drop, cover, and hold on to protect yourself from thepos
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