高中英语人教版 (2019)必修 第一册Unit 4 Natural disasters优秀课件ppt

这是一份高中英语人教版 (2019)必修 第一册Unit 4 Natural disasters优秀课件ppt，共18页。PPT课件主要包含了Lead in等内容，欢迎下载使用。

1. What natural disaster is shwn in the picture?2. Hw much d yu knw abut tsunami?What causes it? Hw t prevent?
Watch a vide t knw mre abut tsunami.
【Ted-ED】Hw Tsunamis Wrk
Tsunami is als called tidal wave.It is unrelated t the tidal activity by the gravitinal frces f the Sun and Mn.It is caused by energy underwater, such as vlcanic eruptin, submarine landslide r earthquake.
When it reaches shallw water, wave speeds slw dwn and its height rises.
Tsunami waves can strike ut f nwhere（突然出现） and cause a lt f destructin. Scientists study and track tsunamis in rder t warn peple and minimize（使最小化） deaths.
Tsunami: Killer waves（波浪）
Befre yu watch
Read the sentences abut the frmatin（形成） and effects f tsunamis. Then match each sentence with the crrect picture.
A. Tectnic plates（地壳板块） push tgether（碰到一起）.B. A series f waves expands（扩张） in all directins（四面八方）.C. Whle sectins（部分） f cities are destryed.
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.
While yu watch
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.
1. 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.2. 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.
After yu watch
3. What shuld we d when a tsunami hits?D yu knw sme safety instructins?
1. evacuate at nce. 2. g as high and as far as yu can3. take yur emergency kit4. stay away frm buildings and bridges
4. Hw t prevent?
1. mnitr underwater pressure and seismic activity. 检测水下压力和地震活动2. establish glbal cmmunicatin netwrks fr quickly distributing alerts.建立全球通信网络
wh t cntact
Hw t prepare fr an earthquake ?Listen and cmplete:
n.&n.轻敲;水龙头
v.&n.吹口哨;哨子
EarthquakePrepare a basic disaster supplies/first-aid kit急救箱 and find a safe place.Drp dwn immediately.Take cver under a desk, table and hld n.Cver yur head and neck with yur hands. Stay away frm windws, r furniture that can fall n yu.If yu are utdrs, find a clear spt away frm trees, buildings, and pwer lines; drp t the grund and cver head and neck.
water fd radi flashlight
cell phne knife glve match
Other items
Emergency Supplies
first aid kit