Weather problem

(1) As can be seen from the title, A: Advantages: acid rain control,

Disadvantages: When encountering a "sandstorm", the driver's master can't see the road clearly and is prone to traffic accidents;

(2) According to the causes of sandstorms, we can know that sandstorms are caused by people cutting down trees excessively.

Vegetation is destroyed, forming a dry desert, and the rotation is blown by strong winds, and the rotation floats all over the sky.

Answer: method: it is forbidden to cut down trees and conserve water and soil; Truth: Tree turf can keep water and soil and prevent wind;

(3) According to the cause of sandstorm, a hair dryer can be used to represent strong wind.

Insert a note in the sand to represent grass, insert a pencil in the sand to represent trees,

Scheme: firstly, dry the spun yarn without pencil and paper with a hair dryer and observe the phenomenon;

Phenomenon: it can be seen that sand characters are easily blown everywhere; Then use a hair dryer to blow the spun yarn with pencil and paper.