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冲走
day by day...
change into desert
转换成，变成
沙漠
A lot of rich land has changed into desert .
sandstorms
come into being
n. 沙尘暴
3 Do you know how sandstorms come into being? Number
the pictures and talk about the sandstorm in groups.
( )
( )
( )
( )
( )
( )
4
1
5
3
6
2
wash the earth away
many trees
change into desert
forests gone
sandstorms come
into being
cut down trees