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All these problems are very serious.
sand
sandstorm
What bad weather !
The wind is so strong !
The wind blows strongly.
The sand really hurts people’s faces.
While we walk down the street,we can’t see anything.
What causes these sandstorms?
How do sandstorms come into being?
many trees
People have cut down too many trees. There are fewer trees left
cut down
forests gone
wash the earth away
冲走
change into desert
转换成，变成
沙漠
As a result, a lot of rich land has changed into desert because people have cut down too many trees.
Sandstorms come into being
Do you know how sandstorms come into being? Number
the pictures and talk about the sandstorms in groups.
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