"Aeolian Landform" Earth's surface form PPT download

"Aeolian Landform" Earth's surface form PPT download

Part One Content: Curriculum Standards:

Through field observation or the use of videos and images, identify 3 to 4 types of landforms and describe the main characteristics of their landscapes.

Literacy goals:

1. Be able to identify various aeolian landforms and describe their characteristics through field observation or the use of videos and images. (geographical practice)

2. Be able to identify the landform types in a given area and summarize the types of aeolian landforms and their distribution characteristics. (regional awareness)

3. Be able to analyze the formation process of aeolian landforms from the perspective of the relationship between various elements of the geographical environment. (comprehensive thinking)

4. Be able to analyze the impact of aeolian landforms on human activities from the perspective of the relationship between man and land. (Coordinated view of man and earth)

Aeolian landform PPT, the second part of the content: essential knowledge and literacy foundation

1. Aeolian landforms

1. Wind force: Wind is the main "sculptor" of the surface form in the _____________ area. The force of the wind causes the ground to _____, forming wind erosion landforms; the sand carried by the wind _____ on the ground, forming various wind accumulation landforms.

2. Types of aeolian landforms:

[Distinguish]Judge right from wrong.

①Wind erosion includes blowing erosion and abrasion. ( )

② The wind-eroded mushrooms are the honeycomb-like shapes on the steep rock walls that have been eroded by the wind. ( )

③The steep slope of the crescent-shaped sand dune is the windward slope. ( )

[Question] Can you name the wind-formed landforms represented by the letters in the picture below?

2. Harm and prevention of sandstorm activities

1. Harm: Destroy buildings, reduce _________, bury houses, farmland, roads, and cause _________ losses.

2. Prevention and control measures:

(1) Set up barriers or _________ to reduce wind speed.

(2) To prevent and control sandstorm disasters, measures such as grass grids, ________, high vertical sand barriers, and ________ can be adopted.

Aeolian landform PPT, the third part: key capabilities and literacy formation

Ability 1: Factors and processes of formation of wind-eroded mushrooms

1. Factors forming wind-eroded mushrooms:

(1) Strong wind: Dynamic conditions are a key factor in the formation of wind-eroded mushrooms. Strong wind can blow up rock debris and sand.

(2) Rich sand sources: desert areas or sandy river valleys, lake shores, and coasts.

(3) Changeable wind direction: If the wind direction remains unchanged, the situation will only be small in the middle and large at both ends on the windward side, which is not the same thing as wind-eroded mushrooms.

2. The formation process of wind-eroded mushrooms:

(1) Wind erosion mushrooms are transformed from wind erosion pillars. Wind erosion pillars are mainly developed in bedrock areas with vertical joints. After long-term wind erosion, isolated columnar rocks are formed, so they are called wind erosion pillars.

(2) The air flow close to the surface contains more sand and has strong abrasive force; the higher it is from the ground, the less sand is contained in the wind and the abrasive force is weak. Wind erosion columns are often eroded into mushroom-like shapes with a large top and a small base. Rocks are called wind-eroded mushrooms.

[Typical example demonstration]

In addition to the snow-white sand, the White Desert of Egypt also has many towering chalk rocks (a type of limestone) standing in it, like huge groups of mushrooms. Therefore, it is also called the "mushroom desert" by the locals. It is a gift from nature. Geological wonders for mankind. Complete questions (1) and (2) accordingly.

(1) The external force responsible for the formation of the mushroom-shaped chalk in the picture is ()

A. Weathering

B.Wind deposition

C.Wind erosion

D.Wind transport

(2) The landforms in the picture are common in my country ()

A.Northeast Plains

B. Qinghai-Tibet Plateau

C. Sichuan Basin

D. Tarim Basin

[Ideas] To solve this kind of problem, you should start from the following points:

(1) Determine the names of landforms and landscapes based on graphic and textual information.

(2) Infer the area where it is located based on the landform and landscape.

[Analysis] (1) Choose C, (2) choose D. Question (1): Wind-eroded mushrooms are formed by wind erosion. Question (2), the landscape shown in the picture is a wind-eroded mushroom, which is a typical landscape in arid areas.

【Literacy Research】

Yadan landform now generally refers to a wind-eroded landform in arid areas. The ground formed by earthy sediments from rivers and lakes has undergone weathering, intermittent water erosion and wind erosion to form wind-eroded mounds parallel to the prevailing wind direction and arranged alternately. and wind-eroded depression (trough) landform combinations. The picture below shows two common Yadan landforms.

(1) (Comprehensive thinking, regional cognition) Infer the main reason for the flat top of the flat-topped mountain-like Yadan landform.

Tip: The flat top of the flat-topped mountain-like Yadan was formed by early flowing water sedimentation.

(2) (Comprehensive thinking) The whaleback-shaped Yadan landform often appears in places with high speed and strong winds all year round. Analyze the causes of the difference in slope on both sides.

Tip: Due to the long-term blowing of high-speed and strong winds, the rock erosion on the windward slope is relatively serious, gradually forming a steep terrain. The other side is located on the leeward slope, and the erosion effect is weak, so the slope is relatively gentle.

Ability 2: Dune Characteristics and Movement

1. Conditions for the formation of sand dunes:

The development and formation of sand dunes is affected by conditions such as wind, ground morphology, moisture, vegetation, and sand source supply.

(1) Wind force and direction: Wind force determines the moving speed of sand dunes, and wind direction determines the moving direction of sand dunes. Generally, the windward slope of sand dunes is gentle and the leeward slope is steep.

(2) Ground undulations: Mountains are obstacles to the movement of wind and sand flow. They are highly undulating, and it is easy for a large amount of sand to accumulate on the windward side, forming huge sand dunes.

(3) Surface material (sand source supply): The amount of sand supply is related to the scale of sand dune development. For example, the sand dunes on the edge of the Taklimakan Desert are lower because there is less fine sand and medium sand on the surface; the sand dunes inside the desert are taller, which is related to the abundance of fine sand and medium sand on the surface.

(4) The better the water and vegetation conditions are, the less favorable it is for the development of sand dunes.

2. Characteristics and movement patterns of moving sand dunes:

(1) Movement: The sand grains on the windward slope continue to cross the top of the dune and slide down under the blow of the wind. In this way, the sand moves continuously, and the dune moves forward slowly, becoming a mobile dune.

(2) Characteristics: The two slopes of the flowing mound are asymmetrical. The windward slope is convex and gentle, while the leeward slope is concave and steep. There is an obvious arc-shaped ridge between the slopes. The height of barchan dunes is generally several meters and rarely exceeds 15 m. The figure below illustrates the movement mechanism of flowing sand dunes.

Keywords: Hunan Education Edition high school geography compulsory course 1 PPT courseware free download, aeolian landform PPT download, earth surface form PPT download, .PPT format;

For more information about the PPT courseware "Earth's Surface Forms and Aeolian Landforms", please click on the Earth's Surface Forms ppt Aeolian Landforms ppt tag.

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