"Entering the World of Dunhuang Aeolian Landforms" Viewing Landforms and Soils from the Circle Function PPT Download

"Entering the World of Dunhuang Aeolian Landforms" Viewing Landforms and Soils from the Circle Function PPT Download

Part One: Basic Overview

1. Overview of Dunhuang

1. Location and scope: It is located at the western end of ____________, at the junction of ______, Qinghai, and ______. To the west is ______, connected to Lop Nur, to the north is the Gobi, and connected to the remaining veins of ______.

2. physical geographical features

Dunhuang's climate is ______, solar radiation is ______, and the temperature difference between day and night is ______, resulting in strong physical weathering of the surface, forming a typical ______ landform under the action of wind.

2. Discussing wind erosion landforms from the "Devil City" of Dunhuang

1. Concept: ______Landform formed by ______ of rocks and sediments.

2. Features: ______, steep body.

3. type

3. Viewing the aeolian landform from Mingsha Mountain

1. Concept: Sand dunes are formed from loose sand blown by wind in ______ areas.

2. Types: ____________, ____________ dunes, barchan dunes.

3. The characteristics of the crescent-shaped sand dunes: the windward slope is relatively ______, and the leeward slope is relatively ______.

Entering the world of Dunhuang landforms PPT, the second part: independent evaluation

1. Judgment questions

1. Wind erosion is weathering. ()

2. Dunhuang "Devil City" is a wind-eroded landform. ()

3. All dunes have gentle windward slopes and steep leeward slopes. ()

4. Yadan is a wind-driven sedimentary landform. ()

5. Aeolian landforms are only found in arid areas. ()

2. Multiple choice questions

The Biela Dune is the largest coastal dune in Europe, with a total length of 2,700 m, a width of 500 m, and a height of 114 m. It was only 35 m high 160 years ago and is still expanding now. Answer questions 6-7 based on the picture.

6. The main geological process that formed the Billa Dunes is ()

A. Wind erosionB. weathering

C. Earth's crust rises D. wind deposition

7. The dominant force behind the ever-expanding Biela Dunes is ()

A. mid-latitude westerly

B． polar east wind

C. Northeast trade winds

D. southwest monsoon

Entering the world of Dunhuang's landforms PPT, the third part: interaction between teachers and students

wind erosion landform

[Scenario introduction temptation]

As the "Arid Kingdom" of Xinjiang, wind has special significance in shaping the landscape. "Yadan" means "precipitous mound" in Uyghur. Due to natural wind erosion, the lower part of the "small mound" often suffers strong erosion, thus gradually forming an inward concave shape. If the rock layer on the upper part of the "small mound" is relatively loose, it will easily collapse under the action of gravity to form a steep wall. This is the "Yadan landform" and is a miraculous work of nature.

The Lop Nur area is located in the eastern part of the Tarim Basin. The Yadan landform is developed here. The Yadan landform is characterized by alternating ridges and grooves, as shown in the figure below. Its development is closely related to the erosion of prevailing winds.

(1) From the perspective of regional cognition, analyze the reasons for the formation of the extreme drought environment in Lop Nur area.

(2) Use comprehensive thinking to list other types of wind-eroded landforms.

(3) Geographic practice ability - If it is known that the northeast wind often blows in the Lop Nur area, guess the extension direction of the Yadan landform ridges and grooves.

Tips: (1) It is located deep inland and far away from the sea; blocked by the Qinghai-Tibet Plateau and mountains, there are few sources of water vapor and strong ground evaporation.

(2) Wind-eroded ridges, wind-eroded mushrooms, wind-eroded columns, wind-eroded depressions, etc.

(3) The ridges and grooves of the Yadan landform are consistent with the prevailing wind direction, and it can be inferred that its extension direction is northeast-southwest.

[Breakthrough in core test points]

1. The manifestations and interrelationships of external forces

2. Causes of wind-eroded mushrooms

The formation of wind-eroded mushrooms is closely related to differences in wind erosion. In arid areas, wind lifts sand and rocks and erodes surface rocks. The erosion near the ground is stronger, so wind-eroded mushrooms are formed.

Entering the world of Dunhuang's landforms PPT, the fourth part: improving literacy

The Mongolian Plateau, Loess Plateau and North China Plateau have a certain connection in their origin due to external forces. Each letter in the figure below represents a different type of dominant external force. Read the picture below and answer questions 1-2.

1. Which of the following statements is correct ()

A. a represents wind erosion

B． b represents the erosion effect of running water

C. c represents the dissolution of running water

D. d represents the transport function of flowing water

2. In process b, phenomena that may occur include ()

A. Sandstorm B. soil erosion

C. Mudslide D. desertification

3. Figures 1 and 2 are typical landforms in the inland northwest region of my country. The main external forces affecting the formation of the landforms in Figures 1 and 2 are ()

A. running water sedimentation, running water erosion

B． Wind deposition, wind erosion

C. running water sedimentation, running water sedimentation

D. wind deposition, wind deposition

Keywords: Free download of the PPT courseware for the compulsory course of high school geography in the Lujiao version, PPT download into the world of Dunhuang wind-formed landforms, PPT download of landforms and soils viewed from the perspective of circle effects, .PPT format;

For more information about the PPT courseware "Looking at Landforms and Soils from the Function of Circles and Entering the World of Dunhuang's Aeolian Landforms", please click the "Looking at Landforms and Soils from the Function of Circles ppt and Entering the World of Dunhuang's Aeolian Landforms" ppt tag.

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