(共25张PPT)
Unit 4 earthquake
Mr. Nature
emotional
（情绪化的）
natural
disasters
Natural Disasters
typhoon
flood
drought
earthquake
volcano eruption
tsunami
land slides
hurricane
earthquake
Look carefully at the two pictures. Describe what you see in the pictures .
But unfortunately ,in 1906 a big earthquake happened in San Francisco. What’s worse, a bigger earthquake happened in Tangshan in 1976 in China.Imagine what might happen to all the things in the photos.
What damages does the earthquake cause
Houses __________.
fell down
Bricks covered the ground .
Brick buildings were destroyed.
Factories,hospitals,schools and the other buildings were gone and lost.
Roads got huge ______.
cracks
Many buses were caught in them.
A huge crack might cut across houses , roads and canals.
Water pipes __________________,
Steam burst from holes or wells in the ground.
cracked and burst
so the water
supply was cut off.
The smoke of fires could be seen.
The electricity lines were___________.
The electricity supply was also ___________.
destroyed
cut off
Bridges and dams _____________ .
fell down
They were not safe for travelling.
Railway tracks became useless pieces of steel.
The transportation was delayed.
Many people _____and_____________.
died
were injured
People were left without families.
The survivors became homeless.
In a few terrible seconds, a large city lay in ruins. Everything was destroyed. It seemed that the world was at an end.
Why do earthquakes happen
Pacific plate
American plate
Eurasian plate
Indian plate
African plate
Antarctic plate
北
Pacific
plate
American plate
San Francisco
Sometimes these two plates stop and do not move for years. Then Suddenly, they jump and an earthquake is felt.
As a result of the movement of these plates, west America near the sea has always been a bad place for earthquakes. When the 1906 earthquake happened, the Pacific plate jumped 5-6 meters to the north.
Why do earthquakes happen
Listening (P62)
