How were the three major plains of our country formed?

The formation process of the North China Plain is a typical alluvial plain, with the Yellow River flooding many times, swinging from north to south, piling up large amounts of sediment on low ground, constantly pushing the coastline eastward, and connecting a large island in the Bohai Sea - that is, the Shandong Peninsula later.

Geologically speaking, the North China Plain-Bohai Sea-Northeast Plain is a belt-like fault area, and the earth's crust has been sinking, so the terrain is low, and it is the sedimentary land of the rivers.

The middle and lower reaches of the Yangtze River Plain itself is also a fault zone, surrounded by a series of fault mountains such as Lushan Mountain (there is an obvious straight mark at the southeast foot of Dabie Mountain, which is clearly shown on the satellite map), the sedimentation of the Yangtze River and its tributaries, so that the Yangtze River along the Yangtze River forms a broad plain, especially in the Yangtze River estuary, a large amount of sediment is deposited, and now Chongming Island is still expanding. Similarly, the Yellow River Delta is growing at an astonishing rate.

In short, the formation of these plains is actually quite simple: they are located in fault zones, and are deposited by rivers.

Alluvial plains, sedimentary plains have almost no branches in our country.

Landlord: Three Plains:

The Northeast Plain, the North China Plain, and the Middle and Lower Reaches of the Yangtze River Plain are the three major plains in China, and the largest plain is the Northeast Plain.

Cause: Northeast Plain.

Including the Songnen Plain and the Sanjiang Plain, Songnen refers to the Songhua River and the Nenjiang River. The three rivers include the Heilongjiang, Ussuri and Songhua rivers. Needless to say, Liaohe. Therefore, there are many plains that are formed by alluvial due to rivers and other reasons, and become alluvial or sedimentary plains.

North China Plain. It is formed by the alluvium of the Yellow River, Haihe River and Huai River, covering an area of 310,000 square kilometers. The altitude is less than 100 meters, and most of them are less than 50 meters.

The terrain is flat, easy to cultivate, and the soil is fertile, with hot and rainy summers, and the annual precipitation is 600 900 mm, which has always been an important agricultural area in China. However, due to the large amount of sediment carried by the Yellow River, the riverbed has been silted up year by year, and the downstream riverbed is 3 4 meters above the ground on both banks, and in some places it is 10 meters higher. The diversion and migration of the lower reaches of the Yellow River also affected the discharge of the Haihe River and the Huaihe River system, resulting in the formation of many shallow flat depressions of different sizes in the North China Plain, with poor drainage and aggravating the threat of flooding.

Plains in the middle and lower reaches of the Yangtze River.

It is formed by the alluvium of the Yangtze River and its tributaries in the east of the Three Gorges of the Yangtze River, south of the Huaiyang Mountains and the Huanghuai Plain, and north of the Jiangnan Hills and the Fujian-Zhejiang Hills. It is one of the three major plains in China, spanning the six provinces of Jiangxi, Hubei, Hunan, Anhui, Jiangsu, Zhejiang and Shanghai. It includes four parts: the Two Lakes Plain, the Poyang Lake Plain, the Central Anhui Plain, and the Yangtze River Delta.

The middle plain area is relatively wide; The plains in the lower reaches are mostly long and narrow along the river. The terrain here is flat, the river is curved, the lakes are dense, and there are directions"Water town Zeguo"called.

Hope it helps!

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Northeast Plains. Located in the territory of the three eastern provinces of our country, it is divided into three parts: Songnen Plain, Liaohe Plain and Sanjiang Plain, it is the largest area of the three plains, up to 350,000 square kilometers, it is known as the black soil, the land here is fertile, the climate is suitable, it is a very important grain producing area in China.

Cause: It is mainly formed by the alluvium of the Liaohe River, Songhua River and Nenjiang River.

Historical changes: In the old days, most of the Songnen Plain and Sanjiang Plain were sparsely populated wastelands, called the Great Northern Wilderness. There are also many uncultivated swamps in the lower reaches of the Liao River, which is called the Southern Great Wilderness.

After 1949, a large area of swamps was drained, large farms were established, and many villages and towns and factories appeared; The Great Northern Wilderness became the Great Northern Warehouse, and the Southern Great Wilderness also became a Panjin reclamation area full of rice fields.

The Sanjiang Flat principle in the northeast is a low-lying flat plain. In the past, it was a mountain basin, and during the rainy season, floodwaters from three major rivers poured into this poorly drained low-lying field, causing the river to overflow. In addition, the latitude of this area is high, the winter is long, the temperature is low, the evaporation is weak, the water stored on the ground can not evaporate, can not seep, and can not be discharged, the long-term water has evolved into China's famous swamp, becoming "in addition to rabbits is wolves, the great Northern Wilderness where weeds are not fed".

North China Plain. Also known as the Huang-Huai-Hai Plain, it is formed by the alluvium of the Yellow River, the Huai River and the Haihe River. To the west of the North China Plain is the Loess Plateau, which is only separated by a mountain, so in recent years, it has often been affected by sandstorms, and the climate is relatively bad and the air pollution is more serious.

However, it is located in the hinterland of our country, with a relatively good economy and is an important grain producing area.

Cause: It is formed by the alluvium of the Yellow River, Haihe River, Huai River, etc.

Historical changes: The frequent diversions of the Yellow River in history made the North China Plain a period of history"Water town Zeguo"

The middle and lower reaches of the Yangtze River plain.

Located in the east of the Sichuan Basin, the altitude is below 50 meters, formed by the alluvium of the Yangtze River, known as the "land of fish and rice", the river network is dense, the water volume is sufficient, and the climate of the water town in the south of the Yangtze River.

Cause: It is formed by the alluvium of the Yangtze River and its tributaries.

Historical changes: The Yangtze River was called the Great River in ancient times, and after the Wei and Jin dynasties, the population increased and was developed on a large scale.

The three major plains in China are all located in the lower reaches of the great rivers, and they are mainly alluvial plains formed by the accumulation of sediment in the rivers.

It is mainly formed by the alluvial of rivers, but also because of the movement of the earth's crust.

It should all be river alluvial plains.

The Northeast Plain, the North China Plain, and the Middle and Lower Reaches of the Yangtze River Plain are the three major plains in China.

Among them, the Northeast Plain is the largest plain in China, the North China Plain is the most populous plain in China, and the middle and lower reaches of the Yangtze River Plain is the most economically developed plain in China. Northeast Plain: The largest plain in China, also known as the Songliao Plain in a broad sense, including most of Heilongjiang, Jilin, Liaoning and part of Inner Mongolia, divided into three parts: the Songnen Plain, the Liaohe Plain and the Sanjiang Plain.

China's three major plains

Northeast Plain: The largest plain in China, also known as the Songliao Plain in a broad sense, including most of Heilongjiang, Jilin, Liaoning and part of Inner Mongolia, divided into three parts: the Songnen Plain, the Liaohe Plain and the Sanjiang Plain. It is located in the east of the Great Xing'an Mountains, west of the Changbai Mountains, south of the Little Xing'an Mountains, and north of Liaodong Bay (belonging to the Bohai Sea).

North China Plain: Also known as the Huang-Huai-Hai Plain, it spans Beijing, Tianjin, Hebei, Henan, Shandong, Anhui, Jiangsu and other provinces and cities. It is divided into three parts: the Haihe River Plain, the Yellow River Plain and the Huaihe River Plain.

It is formed by the alluvial accumulation of the Yellow River, Huai River, Haihe River and other rivers. The North China Plain is bounded by the Taihang Mountains in the west and the Loess Plateau, so it has often been affected by sandstorms in recent years.

Middle and lower Yangtze River Plain: One of the three major plains in China, but not a whole, each part is separated by mountains and connected by the Yangtze River. It is composed of Jianghan Plain, Dongting Lake Plain, Poyang Lake Plain, Yangtze River Delta Plain and other parts.

It is located in Hubei, Hunan, Jiangxi, Anhui, Jiangsu, Zhejiang, Shanghai and other provinces and cities, with an average altitude of less than 50 meters.

The above content reference:Encyclopedia - China's Three Great Plains

China's three major plains are: the Northeast Plain, the North China Plain, and the middle and lower reaches of the Yangtze River, the largest of which is the Northeast Plain. The areas from largest to smallest are:

Northeast Plain (350,000 sq km), North China Plain (300,000 sq km), Middle and Lower Yangtze River Plain (200,000 sq km).

1. Northeast Plain: Located in the territory of the three eastern provinces of China, it is the largest of the three plains, reaching 350,000 square kilometers, and is divided into three parts: the Songnen Plain (in the Songliao Basin), the Liaohe Plain and the Sanjiang Plain (in the Sanjiang Basin). It is known as the black soil, where the land is fertile and the climate is suitable, and it is a very important grain producing area in China.

2. North China Plain: Also known as the Huang-Huai-Hai Plain, it is an important part of the Great Plain in eastern China, partly in the Bohai-North China Basin. It is located at 32° 40° north latitude and 114° 121° east longitude.

It reaches the southern foot of Yanshan Mountain in the north, reaches the north side of Dabie Mountain in the south, leans on Taihang Mountain and Funiu Mountain in the west, borders the Bohai Sea and the Yellow Sea in the east, and spans 7 provinces and cities of Beijing, Tianjin, Hebei, Shandong, Henan, Anhui and Jiangsu, with an area of 300,000 square kilometers. The plain has a flat terrain, numerous rivers and lakes, convenient transportation, and developed economy, and has been the political, economic and cultural center of China since ancient times, and the population and cultivated land area of the plain account for about 1 5 of China.

3. The middle and lower reaches of the Yangtze River Plain is known as one of the three major plains in China, but it is not a whole. Located in the middle and lower reaches of the Yangtze River east of Yichang, Hubei Province, it is composed of the Two Lakes Plain (Hubei Jianghan Plain and Hunan Dongting Lake Plain), Poyang Lake Plain, Jiangsu-Anhui Yangtze River Plain, Lixiahe Plain and Yangtze River Delta Plain, covering an area of about 200,000 square kilometers.

1. Northeast Plain. It is surrounded by the Great Xing'an Mountains, the Small Xing'an Mountains and the Changbai Mountains in the northwest and east respectively, and the Bohai Sea in the south, including the three provinces of Hei, Ji and Liao, and a part of the Inner Mongolia Autonomous Region. The Northeast Pinglun Quecha was originally composed of three parts: the Songnen Plain in the north, the Liaohe Plain in the south and the Sanjiang Plain in the northeast, and there was a slightly raised watershed plateau in the middle of the plain.

2. The Northeast Plain is the largest plain in China, and the surface is known as the fertile black aborigines. Most of the elevations are below 200 meters, and the terrain is open and fertile for thousands of miles. Some of the lowlands on the plains are perennially waterlogged and become swamps.

3. North China Plain. It is located in the south of Yanshan, north of the Huai River, east of the Taihang Mountain, bordering the Bohai Sea and the Yellow Sea, mainly formed by the alluvial sediment of the three major rivers of the Yellow River, the Huai River and the Haihe River, also known as the Huang-Huai-Hai Plain. The Yellow River was the main force shaping the Hua Plain.

In history, the Yellow River once seized the course of the Haihe River in the north and entered the sea from Tianjin; The Huai River in the south enters the sea from the north of Jiangsu, making the North China Plain stretch from Hebei Province to Jiangsu Province. Today, at the mouth of the Yellow River, sediment brought from the Loess Plateau continues to push the Yellow River Delta into the sea, with an average of kilometers per year. The altitude of the North Plain is mostly below 50 meters, and the terrain is flat and endless.

4. Plain in the middle and lower reaches of the Yangtze River. It starts from Wushan in the west and reaches the seashore in the east, and is mainly formed by the sediment alluvial of the Yangtze River eggplant and its tributaries, and extends to the east and west in a narrow shape. The middle and lower reaches of the Yangtze River Plain are neither as open as the Northeast Plain nor as integral as the North China Plain.

The terrain here is lower than the North China Plain, and the Yangtze River Delta in the lower reaches is below 10 meters above sea level. For thousands of years, people have continued to cultivate fields, dig ditches and dig ditches, so that the rivers and canals here are like nets, and the paddy fields are patchy, becoming the famous "land of fish and rice" in China.

The three major plains in China are the Northeast Plain, the North China Plain, and the Middle and Lower Reaches of the Yangtze River Plain. Their characteristics are:1The Northeast Plain, known as the "black soil", reaches 350,000 square kilometers, with fertile land, flat terrain, convenient transportation, and a high degree of mechanical collapse, which is a very important grain production area and commercial grain base in China; 2.

The North China Plain, located in the hinterland of China, has a developed economy, many people and convenient transportation, and is an important grain producing area in China; 3.The middle and lower reaches of the Yangtze River Plain, with developed economy, dense river network and convenient transportation, are suitable for the growth of rice and other crops, and are known as the "land of fish and rice".