人教版（2019）必修第一册 Unit 4 Natural Disasters Video Time课件(共23张PPT，内嵌视频)

(共23张PPT)
Unit 4 Natural Disasters
Video Time
In this class, you will
watch the video to know about tsunami;
discuss how to help the people who have suffered from a tsunami;
talk about the safety instructions about tsunami.
Learning objectives
What natural disaster is shown in the picture
Tsunami
What is a tsunami
What causes it
What is its damage
Look through the picture and introduction
Prediction
Before You Watch
Read the sentences about the formation and effects of tsunamis. Then match each sentence with the correct picture.
A. Tectonic plates(地壳板块) push together.
B. A series of waves expands in all directions.
C. Whole sections of cities are destroyed.
C
A
B
While You Watch
Task1: Decide whether the statements are true (T) or false (F).
1.There are few warning signs just before a tsunami hits.
2. A tsunami breaks just like an ordinary wave but is bigger.
3.Scientists at the Pacific Tsunami Warning Center monitor the earth’s movements 24 hours a day in order to track tsunami.
T
F
T
F
T
F
While You Watch
Check your answers
1. There are few warning signs just before a tsunami hits.
T
F
Check your answers
2. A tsunami breaks just like an ordinary wave but is bigger.
T
F
A tsunami wave doesn’t break like an ordinary wave.
Check your answers
3.Scientists at the Pacific Tsunami Warning Center monitor the earth’s movements 24 hours a day in order to track tsunami.
T
F
While You Watch
Task2: Circle the correct word(s) in each sentence.
1. An earthquake occurs when plates below the earth’s surface push together/pull apart.
2. Tsunami waves deep at sea move fast and rise only a few/ hundreds of feet.
3. As these killer waves enter shallow waters, their speed is reduced/raised.
4. Most tsunami damage is caused when the waves come in from/move back out to the sea.
Check your answers
1. An earthquake occurs when plates below the earth’s surface push together
/pull apart.
Check your answers
2. Tsunami waves deep at sea move fast and rise only a few/ hundreds of feet.
Check your answers
3. As these killer waves enter shallow waters, their speed is reduced/raised.
Check your answers
4. Most tsunami damage is caused when the waves come in from/move back out to the sea.
After You Watch
Task3: Work in pairs. Discuss the questions.
1.What have you learnt about tsunamis
What is a tsunami
What causes it
What is its damage
harbor wave
a natural disaster
tectonic plates
undersea earthquakes
After You Watch
①
③
②
its damage
After You Watch
2.What kind of help do you think people who have suffered from a tsunami need
Trouble and problem Way to help
1.People are injured. Medical team should be sent there.
2.Houses are damaged.
Shelters should be built there.
3.Resouces are cut off.
Food and water should be sent there.
4.People lost their loved ones.
Emotional help should be given.
After You Watch
Task4:Work in groups. Discuss and present your ideas.
What should we do when a tsunami hits
Do you know some safety instructions
Safety instructions:
If you hear tsunami warning, evacuate at once.
Go as high and as far as you can.
Take your emergency kit.
Drop, cover, and hold on to protect yourself from the possible earthquake.
Avoid downed power lines and stay away from buildings and bridges.
After You Watch
Live to tell: Raising Awareness, Reducing Mortality.
----United Nations International Strategy for Disaster Reduction(2016)
Homework
Option 1:
1.Gather more knowledge about tsunami.
2.Draw a mindmap to introduce tsunami.
Option 2:
Write an essay about how to help the people who have suffered from a tsunami .
Thank you