"The World's Largest Loess Accumulation Area - Loess Plateau" Northern Region PPT Courseware 3

"The World's Largest Loess Accumulation Area - Loess Plateau" Northern Region PPT Courseware 3

Can you tell where this reflects the natural landscape?

What is the reason for your judgment?

Do you know which provinces and regions the Loess Plateau is mainly included in?

"Some hills are like huge castles, some are like teams of mammoths, some are like big round steamed buns, and some are like hills torn apart by giant hands, with rough finger marks still left on them..."

——Excerpted from "Journey to the West" by American journalist Snow

1. The Cradle of Civilization

location and range

The Loess Plateau is located in the ______ area, on the ______ step,

It is the largest loess accumulation area in the world, starting from ____________ in the east,

It reaches ____________ in the west, ______ in the south, and ______ in the north.

It covers an area of ​​about 630,000 square kilometers and the average thickness of loess is more than 100 meters.

Ancient Civilization:

The mother river - the Yellow River, the birthplace of ancient civilization,

Primitive farming civilization, the ancestor of China—the two emperors of Yan and Huang,

There are many places of interest and historical sites.

Yan'an cave dwellings, the holy land of revolution, loess customs, white sheep belly handkerchief, Xintianyou, Ansai waist drum

2. Loess blown by the wind

think about it

How did such thick loess form?

Why aren't there other regions?

Evidence for Feng Cheng’s theory:

1. Loess is like snow on the ground in winter, covering various terrains with different undulations with a similar thickness.

This shows that the loess is blown from above, not washed by running water.

2. From northwest to southeast on the Loess Plateau, the particles of loess become increasingly finer.

Explain that the direction of the force is from northwest to southeast.

3. The mineral composition of loess is different from that of the underlying bedrock.

This shows that the loess is not weathered from local rocks, but is imported.

3. Serious soil erosion

Analyze the natural causes and harm of soil and water loss in the Loess Plateau

1. Read Figure 6.34 and talk about the relationship between soil erosion and surface vegetation.

(1) Vegetation has the function of conserving water sources and preserving soil and water.

(2) Vegetation destruction - easy to cause soil erosion.

2. Discuss the effects of different soil textures (sand and clay), different slopes (steep slopes and gentle slopes), and different precipitation intensities (heavy rain and light rain) on soil erosion.

①Soil quality: ______ (sand or clay) is more likely to cause soil erosion.

②Slope: ______ (steep slope or gentle slope) is more prone to soil erosion.

③The ______ the precipitation intensity is, the more serious soil erosion will be.

4. Soil and water conservation

Safeguard:

1. Biological measures: planting trees and grass, etc.

2. Engineering measures: build terraces, build retaining dams, etc.

3. Reasonably arrange production activities, such as returning farmland to forests and grasslands on steep slopes, reducing the amount of grazing in overgrazed areas, etc.

Understand the management of soil and water loss in the Loess Plateau

1. The Loess Plateau is covered with thousands of ravines, and soil erosion in ravines and slopes is particularly serious. Read Figure 6.37 and Figure 6.38 and talk about the role of damming and siltation and slope protection with forest and grass on soil and water conservation.

1. Control of water and soil erosion by "damming and silting": Build ________ in the valley to intercept the ________ lost on the slopes, and accumulate them to form fertile ________.

2. The role of forest and grass slope protection: planting trees and grass and building ________ can effectively slow down the erosion of the surface by heavy rain and running water, reduce the loss of topsoil, and play the role of ________ and ________.

2. Returning farmland to forests and grasslands is a major national measure to protect the ecological environment. Please participate in the discussion on the return of farmland on the Loess Plateau and express your opinions.

Any measures must be taken in a good manner. For the Loess Plateau, neither economic development nor soil and water conservation can be overemphasized.

Single choice

1. The important boundary between the Loess Plateau and the southern region is: ( )

A. Huaihe River B. Qinling Mountains C. Taihang Mountain D. Daxinganling

2. Regarding the formation of the Loess Plateau, the widely supported statement is: ( )

A. Glacier B. Earthquake C. Fengcheng theory D. volcanic ash accumulation

3. The important reasons for the large sediment content in the middle and lower reaches of the Yellow River are: ( )

A. There are many tributaries flowing into it B. There is a lot of precipitation and it is located in a humid area C. The water flow is fast D. Flows through the Loess Plateau area

4. The most important natural disasters in the Loess Plateau are: ( )

A. Drought and flood disasters B. Typhoon C. Cold wave D. earthquake

5. The fundamental measure to control the Yellow River is ( )

A． Build a levee downstream B. Build a reservoir upstream

C． Maintain soil and water in the middle reaches D. Excavation of new river downstream

6. Which of the following statements about the Loess Plateau is correct ( )

A． The ground is rugged and a mountainous plateau

B． Limestone is widely distributed and karst landforms are developed

C． It is the place where loess is most widely distributed and thickest in the world.

D． There are many valleys and lakes on the plateau.

7. Among the following four groups of cities, the one that is located on the Loess Plateau and is the central city of a provincial administrative region is ( )

A． Lanzhou, Xi'an, Taiyuan B. Taiyuan, Xi'an, Baotou

C． Yan'an, Taiyuan, Lanzhou D. Zhengzhou, Xi'an, Lanzhou

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"The World's Largest Loess Accumulation Area - Loess Plateau" Northern Region PPT Courseware 2:

"The World's Largest Loess Accumulation Area - Loess Plateau" Northern Region PPT Courseware 2 1. The Cradle of Civilization 1. Location and Scope Scope: Starting from Taihang Mountain in the east, reaching Wushaoling in the west, reaching the Great Wall in the north, connecting the Inner Mongolia Plateau, and reaching the Qinling Mountains in the south. Cross-provincial areas: Shanxi Shaanxi ..

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"The World's Largest Loess Accumulation Area - Loess Plateau" Northern Region PPT Courseware 1. The Cradle of Civilization Let me summarize: 1. Explain the scope of the Loess Plateau in terms of provinces and regions. 2. Find the boundaries of the Loess Plateau in the diagram. 3. Let’s talk about the significance of the Loess Plateau and the Yellow River to Chinese civilization...