人教版 (2019)必修 第一册Unit 4 Natural disasters精品课件ppt

这是一份人教版 (2019)必修 第一册Unit 4 Natural disasters精品课件ppt，共24页。

Watch the vide t knw abut tsunami.T be able t describe the prcess f a disaster by watching the vide.T talk abut the safety instructins abut tsunami.Discuss n the relief wrk after tsunami.
Teaching Prcess
Vide TimeTsunami: Killer Wave
Watching fr Discussin r Writing
What is tsunami?
What Causes a 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.
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.
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 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.
A.Tectnic plates push tgether. B. A series f waves expands in all directins. C. Whle sectins f cities are destryed.
Befre yu watch Read the sentences abut the frmatin and effects f tsunamis. Then match each sentence with the crrect picture.
strike ut f nwhere从无到有，突然袭击
minimise把……减少到最低程度
track tsunamis追踪海啸
What is it mainly abut?
1.a series f 2.push tgether3.tectnic plates4.whle sectins f5.in all directins
large parts f the earthall f …here and there, everywhereget clser and clsera lt f, many
Match the tw clumns with the similar meaning.
While yu watch 1.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 it's bigger. 3)Scientists at the Pacific Tsunami Warning Center mnitr the earth's mvements 24 hurs a day in rder t track tsunamis.
hit vt. 打击；袭击；碰撞；偶然发现；伤……的感情vi. 打；打击；碰撞；偶然碰上
mnitrn. 监视器; 监听器; 监控器; 班长; vt. 监控;
2.Circle the crrect wrds 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.
Answer:1)_____2)_____3)_____4)______
After yu watchWrk in pairs. Discuss the have yu learnt abut tsunamis? 2.What kind f help d yu think peple wh have suffered frm a tsunami need?
1.关闭核电站2.切断危险源3.制动列车4.成功预测5.为海啸受灾人民捐款
shut dwn nuclear pwer plantscut ff the surce f dangerstp the trainmake a successful predictin f…dnate t the peple affected by the tsunami
开展灾害教育提高公众素养开展防灾演练建造更安全的房子开发新材料新装置
carry ut disaster educatinraise public awarenesscarry ut disaster preventin drillbuild safer husesdevelp new materials and devices
2.What kind f help d yu think peple als need?
 A summary f the news reprt includes:1.Headlines: Headlines are editrs' cndensed summaries f the mst newswrthy : The first paragraph r sentence at the beginning f a : T use sufficient facts t express the theme, t intrduce the cntent f the further develpment and : Usually the last sentence r paragraph. It usually makes a summary f the whle text r predicts the develpment trend f the news events.
Mre kinds f summaries
议论文的内容概要:1)观点 2)论据 3)结论几个段落的中心就是文章主旨。有一分为二的观点，两种观点都要概括。
The argumentative essay abstract :1) pinin 2) argument 3) cnclusin
The center f the paragraphs is the main idea.There are tw pints f view, bth f which need t be generalized.
Hw t Fight Against Tsunami? Tsunami, caused by the dispsitin f the earth's crust under the sea and the eruptin f the vlcan, is a kind f devastating catastrphe. Actually when it cmes t tsunami, it is truly tugh t prevent it perfectly, but it is still essential t d sme preparatins. The first thing yu need t d is t pay attentin t the weather reprt. If yur huse is clse t the sea, yu cannt be cautius abut it. When it is reprted that it will rain heavily and yu sense the light mments f the earth, yu'd better mve int sme safer places as sn as pssible.
Reading fr help
Secndly, it is f vital imprtance that yu prepare a first aid kit and put sme imperative gds int it, like pure water, sme biscuits and clthes. Eventually, try t keep yur mind clear enugh t get thrugh this disaster. While tsunami is drawing near, yu shuld take with the first aid kit and run far away frm the castline, which is exceedingly dangerus. But at the same time yu will be aware that yur speed cannt match up with the tsunami. Therefre, making a right chice is fatal. Running up t sme high slpes r the buildings, climbing up t a big and sturdy tree r clutching a ple are right dings. If yu are unfrtunate enugh t be swallwed away, grasping flating bject like beds, bards r stumps, yu will have a slim chance f survival.
Generally speaking, a tsunami will last prbably several minutes, even several hurs. S here the first aid kit cmes t handy, which will save yu in the emergency while drifting n the sea. It is necessary t adpt sme self-saving actins like taking ff wet clthes t maintain the average bdy temperature, eating sme raw fish r sea creature t keep strength r making sme marks t be nticed. It wuld be impssible t survive withut strng belief and mind.
After being rescued, yu shuld have a thrugh check in hspital and take care f yurself. Be cautius abut the water and fd, which cntains a large sum f bacteria and txins after the tsunami, leading t infectius disease. In fact, it is n use crying ver the lss f material things that belng t yu, fr nthing is mre imprtant than life. Survival is everything. When yu get recvered, yu can pitch in with the recnstructin f yur huse and cmmunity.
Expressins fr help and rescue
1.Pay attentin t the weather reprt.
2.Mve int sme safer places as sn as pssible.
3.Prepare a first aid kit and put sme imperative gds int it, like pure water, sme biscuits and clthes.
Befre a disaster, yu need t…
1. Chse a natural disaster that interests yu the mst.2. Gather infrmatin abut it (the cause, the effect, the safety instructins...).3. Make a pster t intrduce the disaster.