"Aeolian Landform" Earth's surface form PPT

"Aeolian Landform" Earth's surface form PPT

Part One: Strengthening the Implementation of Basic Knowledge

[Self-reading textbook·Fill in key points]

1. Wind effect

1. Region: arid and semi-arid areas.

2. Types of landforms formed: _____ landforms and _____ landforms.

2. Wind-eroded landforms

1. wind erosion

(1) Concept: The ground material _____ remains in place under the action of wind.

(2) Type: _____ function and _____ function.

2. wind erosion landform

(1) Concept: The surface form formed by _____.

(2) Main types: wind-eroded mushrooms, wind-eroded columns, wind-eroded niches, wind-eroded residual hills, wind-eroded trenches, etc.

3. Aeolian landforms

1. Concept: Various surface forms formed by sand particles carried by the wind and settling on the ground when the wind speed decreases.

2. Typical landforms: various forms of _____, _____ is the most basic form.

4. Harm and prevention of sandstorm activities

1. harm

Destroy buildings

Reduce soil fertility

Bury houses, farmland, roads, etc.

Affect people's normal production and life

causing loss of life and property

2. Prevention

(1) Set up barriers or _____.

(2) Take measures such as grass grids, stone grids, high vertical sand barriers, and protective forest belts.

Aeolian landform PPT, part 2: Pay attention to problem-based teaching

Question 1: What are the types and causes of aeolian landforms? Important and difficult test points

[Thinking and exploring]

Dunhuang belongs to Jiuquan City, Gansu Province and is located at the westernmost end of the Hexi Corridor. When mentioning Dunhuang, everyone will invariably think of Dunhuang Mogao Grottoes, Mingsha Mountain and Crescent Moon Spring. Crescent Moon Spring is located in the southern part of Dunhuang Highlands and is part of an ancient river. Its formation and existence are related to its special geographical location.

[Problem Design]

1. Use "comprehensive thinking" to analyze what type of landform Mingsha Mountain belongs to? What are the main external forces that form this landform type?

Tip: Aeolian landforms (sand dunes). Wind accumulation effect.

2. Use "comprehensive thinking" to analyze the reasons why Crescent Moon Spring is located in an arid area but has not dried up for thousands of years.

Tip: Crescent Lake is located in the basin terrain and is a residual lake formed by sand dunes blocking ancient river channels. Crescent Moon Spring is continuously supplied by the infiltration of surrounding river water, so it never dries up.

3. A scientific expedition team discovered a "Devil City" in the northwest of Dunhuang. From the perspective of "geographical practice", what types of landforms may there be here? Which landform type does it belong to? And explore why this place is called "Devil City."

Tips: Wind-eroded pillars, wind-eroded mushrooms, wind-eroded niches, etc. It is a wind-eroded landform. Due to the various wind-eroded landforms in the area, various shrill screams are emitted when strong winds blow at night, so it is called "Devil City".

[Training to pass the test]

Read the schematic diagram of a certain landform and landscape and answer questions 1 to 3.

1. This type of landform landscape is common in my country ()

A. Hainan Island

B． Sichuan Basin

C． North China Plain

D． Junggar Basin

2. The most consistent description of the climate characteristics of this type of landform landscape area is ()

A. High temperatures and rainy weather throughout the year B. Hot and rainy summer

C． Precipitation is scarce throughout the year D. The annual temperature range is small

3. This type of landform landscape was formed in ()

A. Water erosion b. running water accumulation

C． Wind erosion D. wind accumulation

Question 2: How to distinguish between wind erosion landforms and wind accumulation landformsBasic test points

[Thinking and exploring]

Located 184 km west of Dunhuang City, an area of ​​398 km2 has a unique landform (as shown below) and has become a filming location for many film and television works. The pictures below are two stills from the movie "Xuan Zang of the Tang Dynasty".

[Exploration 1] What are the background landforms in the two stills?

Tip: Picture A shows sand dunes (wind-eroded landforms), and Picture B shows wind-eroded castles (wind-eroded landforms).

[Exploration 2] What are the effects of these two types of landforms?

Tip: The landform in Picture A is formed by wind sedimentation, and the landform in Picture B is formed by wind erosion.

[System Cognition]

1. Types of aeolian landforms

(1) The erosion of ground materials by wind and the abrasive effect of wind and sand are collectively referred to as wind erosion. Wind-eroded landforms are formed through the blowing and abrasive effects of wind and sand flow on soil surface materials and bedrock. The main types include wind-eroded mushrooms, wind-eroded castles, wind-eroded valleys, wind-eroded depressions, etc.

(2) Aeolian landforms are landforms formed by the accumulation of materials transported by wind under certain conditions. Aeolian landforms mainly refer to sand dunes in desert areas. Due to different wind, moisture, vegetation and other conditions in different places, the shape of sand dunes is very complex and diverse. Changes in wind speed, ground structure, underlying surface properties, or encountering obstacles, etc., will all change the capacity of the sand flow. When the capacity decreases, the material in the saturated sand flow falls from the air flow and accumulates, thus forming various wind accumulation landforms.

2. How to distinguish aeolian landforms

Different forces

Aeolian landforms are wind erosion, and aeolian landforms are wind deposition, which have opposite effects.

Different landforms

There are various types of wind-eroded landforms, which are affected by wind direction, wind strength, rock properties, rock exposure conditions, etc.; while aeolian landforms mainly refer to sand dunes or sand ridges.

difference in distribution

Wind-eroded landforms are mostly distributed in areas with strong winds, while aeolian landforms are mostly distributed in places with relatively small winds and significant sedimentation.

[Training to pass the test]

1. The following landforms are aeolian landforms ()

A. Sandbar B. beach

C． sand dunes d. Sapa

2. Among the following natural elements, which ones have nothing to do with the aeolian landforms in Northwest China ()

A. Dry climate with little precipitation

B． Vegetation is sparse and sand fixation ability is weak

C． Strong winds and strong erosion and transport

D． Lakes are mostly saltwater lakes with high salinity

3. The most classic distribution areas of wind-eroded landforms such as wind-eroded mushrooms and wind-eroded depressions in my country are ()

A. Junggar Basin B. Yunnan-Guizhou Plateau

C． Inner Mongolia Plateau D. loess plateau

Question 3: What are the characteristics of crescent-shaped sand dunesBasic test points

[Thinking and exploring]

The following text excerpt is a description of a certain natural landscape: "Suddenly, a long stretch of yellow sand in the distance came into my eyes. Even further away were rolling hills, which were also made of pure yellow sand. Here is The world of yellow sand, the ocean of yellow sand, the endless yellow sand meets the sky, it is impossible to imagine where the sand ends!"

Aeolian landform PPT, the third part: carrying out structural evaluation of thinking

Structural evaluation of thinking——The changes of the ancient city of Loulan

According to "Historical Records·Biography of Dawan" and "Hanshu·Biography of the Western Regions", Loulan was a famous "city outline country" in the Western Regions as early as the 2nd century AD. It leads to Dunhuang in the east, Yanqi and Yuli in the northwest, and Ruoqiang and Qiemo in the southwest. Before the 3rd century AD, Loulan and its surrounding areas had many rivers, lush Populus euphratica forests, and fertile land. Loulan became an important town on the Silk Road. But by the 4th century AD, Loulan's name suddenly disappeared from the literature. Nowadays, people can see that not far from the end of the Tarim River, the ruins of the ancient city of Loulan lie silently, and the ruins tell people about the glory and vicissitudes of the past. Ask students to discuss the reasons why the ancient city of Loulan disappeared?

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.

"Aeolian Landforms" Earth surface form PPT courseware:

"Aeolian Landform" PPT courseware on earth surface morphology Part 1: Basic review 1. Overview 1. _________ is the main sculptor of surface morphology in arid and semi-arid areas. 2. Aeolian landform, wind-eroded landform, aeolian landform 2. Wind-eroded landform 1. Wind erosion (1..

"Flowing Water Landform" Earth's surface form PPT download:

"Flowing Water Landform" PPT download of the earth's surface form Part One: Basic review 1. Overview The landform shaped by _________ is called flowing water landform. Generally speaking, flowing water landforms can be divided into ________ landforms and ________ landforms. 2. Landforms eroded by flowing water..

"Flowing Water Landform" Earth surface form PPT courseware:

"Flowing Water Landforms" Earth Surface Forms PPT Courseware Part One Content: Course Standards: Through field observation or the use of videos and images, identify 3 to 4 landforms and describe the main characteristics of their landscapes. Literacy goals: 1. Be able to identify the types of river landforms in different reaches of the basin..