高一【英语(人教版)】Unit 4 Natural Disasters Video Time课件.pptx

Unit 4 Natural Disasters Video Time 年 级：高一 学 科：英语（人教版） Learning objectives In this class, you will collect information about the cause and the damage of a tsunami; learn about scientists’ efforts to predict a tsunami. 2 What natural disaster is shown in the pictures? Tsunami What is a tsunami? What causes it? What is its damage? BEFORE YOU WATCH tectonic plates 地壳板块 expand v. to become bigger in size 扩大 C A B WHILE YOU WATCH 4 WHILE YOU WATCH 5 WHILE YOU WATCH 6 There are few warning signs just before a tsunami hits. A tsunami breaks just like an ordinary wave but is bigger. Scientists at the Pacific Tsunami Warning Center monitor the earth’s movements 24 hours a day in order to track tsunamis. T F T WHILE YOU WATCH 7 There are few warning signs just before a tsunami hits. T WHILE YOU WATCH 8 A tsunami breaks just like an ordinary wave but is bigger. F WHILE YOU WATCH 9 Scientists at the Pacific Tsunami Warning Center monitor the earth’s movements 24 hours a day in order to track tsunamis. T WHILE YOU WATCH 10 WHILE YOU WATCH 11 WHILE YOU WATCH 12 An earthquake occurs when plates below the earth’s surface push together / pull apart. WHILE YOU WATCH 13 Tsunami waves deep at sea move fast and rise only a few/ hundreds of feet. WHILE YOU WATCH 14 As these killer waves enter shallow waters, their speed is reduced/ raised. WHILE YOU WATCH 15 Most tsunami damage is caused when the waves come in from/ move back out to the sea. 16 16 WHILE YOU WATCH What have you learnt about tsunamis? What is a tsunami? What causes a tsunami? What is the damage of a tsunami? 17 WHILE YOU WATCH 17 What causes a tsunami? 18 WHILE YOU WATCH 18 What is the damage of a tsunami? 19 WHILE YOU WATCH 19 What do scientists do in predicting a tsunami? 20 WHILE YOU WATCH 20 If they discover a quake big enough to _______ a tsunami, the scientists try to find out ______ the wave will head and warn people in its _____. cause where path Fill in the blan