1、本网站免费注册后即可以下载，点击开通VIP会员可无限免费下载！
2、资料一般为word或PPT文档。建议使用IE9以上浏览器或360、谷歌、火狐浏览器浏览本站。
3、有任何下载问题，请联系微信客服。
扫描下方二维码，添加微信客服
《Unit 6 Earth first》优质教学PPT课件（统编外研版）下载
Environmental problems to be solved
Can you list out some environmental problems to
be solved?
Did you know?
Smog comes from the words “smoke” and “fog”, and it is used to describe the air pollution in cities caused mainly by traffic
and factories. Smog can be dangerous because it causes severe breathing problems and infections.
Activity 1: Thinking and answering
1.Where does the word “smog” come from?
Smog comes from the words “smoke” and “fog” .
2.What is it used to describe?
It is used to describe the air pollution in cities caused mainly by traffic and factories.
Activity 1: Thinking and answering
3.Why is it dangerous?
Smog can be dangerous because it causes severe breathing problems and infections.
Watch a video
Let’s watch a video and get some more information about smog.
Watch the video
The components of smog
Smog contains fog and haze. Fog consists of a large number of tiny water or ice. They make the visibility worse. Haze is air pollution. It is mixed up with dust, smoke and other dry articles.
The component that makes up haze may have a negative effect on people’s health, especially for the old and children.
Causes of smog
1. The heavy traffic causes air pollution.
The increasing numbers of cars in the city area send off a
lot of poisonous gas.
2. Factories keep emitting dangerous material that causes smog.