Module 4 Sandstorms in Asia

(共15张PPT)
Sandstorms have
been a major
disaster for many
Asian countries
. Scientists have
tried many ways
to solve this
problem. And the
chinese government
Is giving more
attention to the
problem.
这张照片是3月17日由NASA的OrbView-2卫星拍摄的真彩色照片
。在照片上，沙尘已经越过黄海，到达了日本以东的太平洋上空。
事实上，这次10年以来中国北方最大的沙尘暴不仅仅影响了日本，
据美国国家海洋和大气局（NOAA）报告，这次的沙尘暴已经跨越
太平洋，于27日到达了美国西海岸！
Fast reading :
Look at the photos . Read the text quickly and answer the questions .
1. What is happening
2. What is the cyclists wearing
and why
3. What do you think happen to traffic in this situation Why
4. What do you think experts advise people to do in this situation
Read the passage and fill in the blanks with the words in the box
Fright solve forecast get caught in
1.Scientists have tried many ways to _________this
problem.
2.To have __________________a sandstorm was
a terrible experience.
3.It was the most __________ and the most dangerous
situation I’ve ever been in
4.The Weather Station can___________ a sandstorm
some weeks before it arrives.
solve
been caught in
frightening
forecast
Careful reading to find more information.
What’s the cause of sandstorms
What caused sandstorms
Sandstorms are caused by strong winds blowing over loose soil or sand, and picking up so much of that material that visibility is reduced. In desert regions at certain times of the year, sandstorms become more frequent because the strong heating of the air over the desert causes the lower atmosphere to become unstable. This instability mixes higher winds in the middle troposphere downward, producing stronger winds at the surface. In the United States, these events are often referred to as "dust storms".
What’s the damage of sandstorms
Damage of sandstorms
1. Sandstorms can pollute the atmosphere and carry away top soil. When the top soil is carried away, on which plants grow, land becomes barren, yielding much less.
2. Also the breaking out of sandstorms brings more solid pollutants into the atmosphere and damages the environment.
3. Even sandstorms can kill people and animals and pull down buildings. In fact, sandstorms cause as much damage as typhoons and hurricanes.
Work in groups to discuss this question
What should be done to prevent sandstorms
Discussion:(C层）
Since Beijing urgently needs to improve the
environment to prepare for the Beijing 2008
Olympic Games, let’s write a letter to the
mayor of Beijing, suggesting some ideas to
prevent sandstorms.
Dear Sir,
I’m a middle school student .I want to give some
Ideas to prevent sandstorms………
Writing (A,B层）
　　Measures and Suggestions
certain administrative methods be taken to turn desertification preventions into the record to evaluate the work of local government officials.
the issue of desertification prevention should be included in the national economic and social development program for the 21st century, and it should be on the list of key national projects and items
the prevention plans must be drawn up scientifically, and the management must be strict.
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importance should be attached to experts' participation in the project, and the building of a new type of structure which combines production, scientific research and promotion under the new circumstances.
we must do a good job of monitoring and forecasting desertification. We must also establish an information network for national desertification and sandstorm prevention, with forecasting work focused on controlling desertification at the beginning stage.
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Homework:
After class finish the composition.
Try to remember what we study about the sandstorms.