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"Reducing Land Erosion" Earth's surface and its changes PPT download
Part One: Introduction to the new lesson
Flowing water, wind, glaciers, waves and gravity all erode land
The reduction and loss of land is a serious problem that humans are currently facing, and it is related to human life, such as destruction of vegetation and overgrazing.
(1) Design and build our homes
It is best to build houses in their transition zone, which has the geographical advantages of plains and mountains while avoiding the common geographical disadvantages of plains and mountains.
(2) What impact does heavy rain have on our homes?
Exchange and discuss experimental results
(1) Has our home withstood the attack of heavy rain? Where did the water go? Are our homes and terrain affected?
(2) Observe whether the "runoff" is turbid? What does this mean?
(3) Are the experimental results the same as we predicted? What was not considered well?
(4) What needs to be improved?
Reduce land erosion PPT, Part 2: Extension
Heavy rain is a kind of disastrous weather that often causes floods and severe soil erosion, leading to major economic losses such as engineering failures, embankment failures, and crop flooding.
Sandstorm refers to a weather phenomenon in which strong winds raise dust and sand on the ground, making the air turbid and causing horizontal visibility less than 1km. It is one of the world's meteorological disasters, which directly destroys the ecological environment, endangers human health, and affects social and economic development.
Debris flow refers to a special torrent that carries a large amount of sediment and rocks due to landslides caused by heavy rain, snow or other natural disasters in mountainous areas or other areas with deep ravines and steep terrain. Debris flows are characterized by suddenness, fast flow speed, large flow, large material capacity and strong destructive power.
Reduce land erosion PPT, Part 3 content: Class summary
Various natural forces and human activities are reshaping the topography, and they will affect human life. We must protect our homes and try our best to reduce the occurrence of disasters.
Unit summary
What forces will change the topography?
What kind of disasters will the various forces of the earth, including humans themselves, cause to us when they change the topography of the earth's surface?
What measures have humans taken to prevent disasters from occurring and reduce the harm they cause?
Reduce land erosion PPT, Part 4: Classroom training
1. Judgment
1. The reduction and loss of land is a serious problem currently faced by mankind. ( )
2. There is no way to control soil erosion. ( )
3. The shape of the earth's surface is constantly changing due to the influence of natural forces. ( )
4. Afforestation and returning farmland to forests can reduce soil erosion. ( )
2. Choice
1. Which of the following terrains has been changed due to human activities ( )
A.Three Gorges Dam B.Barren mountains and strange rocks C.Sichuan Basin
2. How humans can reduce the occurrence of natural disasters ( )
A. Build water conservancy projects B. Convert farmland to forests
C. Do a good job in prevention and control and improve disaster resistance
Reduce land erosion PPT, Part 5: Homework
Write a public service announcement to educate people about how storms or dust storms change people, animals, plants, or the land.
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For more information about the PPT courseware "The Earth's Surface and Its Changes to Reduce Land Erosion", please click the Earth's Surface and Its Changes ppt to Reduce Land Erosion ppt tag.
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