英语必修 第一册Unit 4 Natural disasters评课ppt课件

这是一份英语必修 第一册Unit 4 Natural disasters评课ppt课件，文件包含VideoTimepptx、TSUNAMISmp4、Tsunami-killerwavemp4等3份课件配套教学资源，其中PPT共16页， 欢迎下载使用。

UNIT 4 NATURAL DISASTERS
Watch the vide t knw abut tsunami.T talk abut the safety instructins abut tsunami.Discuss n the relief wrk after tsunami.
Tsunami waves can strike ut f nwhere and cause a lt f destructin. Scientists study and track tsunamis in rder t warn peple and minimize deaths.
Tsunami: Killer waves
What is tsunami?A tsunami is a series f cean waves that sends surges (急剧上升) f water, smetimes reaching heights f ver 100 feet (30.5 meters), nt land. These walls f water can cause widespread destructin when they crash ashre.
What Causes a Tsunami?These waves are caused by large, undersea earthquakes at tectnic plate bundaries. When the cean flr at a plate bundary rises r falls suddenly, it displaces the water abve it and launches the rlling waves that will becme a tsunami. It may als be caused by underwater landslides r vlcanic eruptins.
What shuld we d when a tsunami hits?D yu knw sme safety instructins?
If yu hear tsunami warning, evacuate at nce. G as high and as far as yu can – at least t a spt 30 meters abve sea level r 2 miles away.Take yur emergency kit. Drp, cver, and hld n t prtect yurself frm the pssible earthquake. Avid dwned pwer lines and stay away frm buildings and bridges frm which heavy bjects might fall during an aftershck.
Read the sentences abut the frmatin and effects f tsunamis. Then match each sentence with the crrect picture.
A. Tectnic plates push tgether.B. A series f waves expands in all directins.C. Whle sectins f cities are destryed.
Decide whether the statements are true (T) r false (F).1. There are few warning signs just befre a tsunami hits.2. A tsunami breaks just like an rdinary wave but is bigger.3. Scientists at the Pacific Tsunami Warning Center mnitr the earth’s mvements 24 hurs a day in rder t track tsunami.
A tsunami wave desn’t break like an rdinary wave.
Circle the crrect wrd(s) in each sentence.
1. An earthquake ccurs when plates belw the earth’s surface push tgether/pull apart.2. Tsunami waves deep at sea mve fast and rise nly a few/hundreds f feet.3. As these killer waves enter shallw waters, their speed is reduced/raised.4. Mst tsunami damage is caused when the waves cme in frm/mve back ut t the sea.
What have yu learnt abut tsunamis? I’ve learnt that they are dangerus/ that they aren’t nticeable r strng until they hit the cast.What kind f help d yu think peple wh have suffered frm a tsunami need? They need fd, water, shelter, etc. They may als need medical help and emtinal help if they have lst lved nes.
Wrk in pairs. Discuss the questins.
Let’s watch anther vide abut tsunami.
Write a passage in 70 wrds abut hw t help the peple wh have suffered frm a tsunami.