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必修三《Unit 2 Natural disasters》Welcome to the unit speaking优秀ppt课件
Reading 1
The evolution of video and sound devices
高中英语 必修（第三册）
Unit 2 Natural disasters
Welcome to the unit
1. What can you see in the pictures?
2. What do you think may have happened in the pictures?
Lead-in
Plates moving underground can cause an
earthquake, which is of
the earth’s surface.
When a volcano erupts, ,
volcanic ash and even rocks escape
through a large opening at the top.
A large amount of falling
down a hill or mountain is called
a landslide.
Video time
a sudden shaking
hot gases