The history of the formation of the Yangtze River The Yangtze River is the largest river in Asia, with its basin area, length and water volume ranking first in Asia. It originated from Gladin Winter Snow Peak, the main peak of Tanggula in Qinghai-Tibet Plateau. There are many tributaries of the Yangtze River. The length of the Yangtze River basin is about 32 19 kilometers from east to west and about 966 kilometers from north to south. With a total length of more than 6,300 kilometers, the Yangtze River is the third longest river in the world, second only to the Nile River in Africa and the Amazon River in South America, and second only to the Amazon River and Congo River in Africa, ranking third in the world.
The Yangtze River began to form in the Jurassic Yanshan Movement/kloc-0.40 billion years ago, forming the Tanggula Mountains in the upper reaches of the Yangtze River, and the Qinghai-Tibet Plateau rose slowly, forming many mountains, deep valleys, depressions and rift valleys. Dabie Mountain and Wushan Uplift between Sichuan and Hubei in the middle and lower reaches of the Yangtze River, Sichuan Basin depression, and the ancient Mediterranean further retreated westward. /kloc-Cretaceous 0/0 billion years ago. Sichuan basin rises slowly. With the continuous development of leveling, Yunmeng and Dongting basins are sinking. Eocene, 30-40 million years ago, the Himalayan movement was strong, the Qinghai-Tibet Plateau rose, the ancient Mediterranean disappeared, and the Yangtze River basin generally rose intermittently. Its rising degree is moderate in the east and severe in the west. The mountains on both sides of Jinsha River are raised, and the Qinghai-Tibet Plateau and Yunnan-Guizhou Plateau are obviously raised, and some fault basins are formed at the same time. Under the strong downward cutting of rivers, many deep and steep canyons appeared, and the water systems that originally flowed from north to south merged with each other and flowed eastward. The middle and lower reaches of the Yangtze River rose slightly, forming middle and low mountains and hills, and the depressed areas sank to the middle and lower reaches of the Yangtze River (the two lakes plain, Nanxiang plain, Duyang plain, Jiangsu and Anhui plain, etc.). ) 30 million years ago, the Himalayas rose strongly and the western part of the Yangtze River basin rose further. The erosion of the ancient Yangtze River extending from Hubei to Sichuan Basin is accelerated, and it passes through Wushan Mountain, which makes the ancient Yangtze River connect with the east and west, and the Minjiang River and Jinsha River meet in Yibin, Sichuan to form the Yangtze River. The mighty river flows into the East China Sea, which is very majestic.
In China ancient literature, commonly used? Jiang? Especially the Yangtze River. Did Wang Xizhi and Sun Chuo use this earlier in the Eastern Jin Dynasty? Yangtze River? In the name of ... Wang Xizhi wrote to Yin Hao and said? Today's army is broken from the outside and its capital is consumed from the inside. The ambition to protect the Huaihe River is out of reach, and there is no better way than to protect the Yangtze River! ? ("Jin Shu? Biography of Wang Xizhi); Sun Chuo said:? The sky is still green, and middle school is a dragonfly. It is not only faith and obedience that are integrated with heaven and earth, but also the ears guarded by the Yangtze River painting. ? ("Jin Shu? Sun Chuo Chuan)
Name of each section of the main stream of the Yangtze River: from the source to the mouth of Dangqu (what is the Tibetan name of this river? Qu? ) The source of the Yangtze River is detached, with a length of 358 kilometers; From Dangqukou to Batang Estuary in Yushu County, Qinghai Province, it is called Tongtianhe, with a length of 8 13 km; Tongtianhe meets the Chumar River, the northern source of the Yangtze River, which originated in the hinterland of Hoh Xil, and then flows southeast to the Batang estuary in Yushu County. Batangkou to Minjiang Estuary in Yibin, Sichuan, known as Jinsha River in ancient times, is 2308 kilometers long; Yibin Minjiang River mouth to the mouth of the Yangtze River, about 2800 kilometers, commonly known as the Yangtze River, of which Yibin to Yichang, Hubei Province is called? Chuanjiang? What about the Three Gorges section from Fengjie to Yichang? Xiajiang? Said), Yichang, Hubei Yidu to Chenglingji, Hunan, called Jingjiang (Jingjiang has? Jiuqu ileum? Yangzhou and Zhenjiang in Jiangsu Province are also called the Yangtze River. It joins the East China Sea in Shanghai. Plateau and mountainous areas account for 65.6% of the basin area; Hills account for 24%; Plains and lowlands account for 10.4%. The Yangtze River is well-developed in shipping, isn't it? Golden waterway? Known as.
The tributary lakes include Yalong River, Minjiang River, Tuojiang River, Chishui River, Jialing River, Wujiang River, Xiangjiang River, Yuanjiang River, Hanjiang River, Ganjiang River, Qingyijiang River, Huangpu River and other important lakes such as Dianchi Lake, Caohai Lake, Honghu Lake, Dongting Lake, Poyang Lake, Chaohu Lake and Taihu Lake, which intersect with the Beijing-Hangzhou Canal in Zhenjiang City, Jiangsu Province. Hanjiang River is the largest tributary of the Yangtze River.
The historical changes of the Yangtze River The ancient Yangtze River was formed in ancient times, and most of the Yangtze River basin was submerged by seawater. During the Triassic period 200 million years ago, the Yangtze River basin was still occupied by the ancient Mediterranean Sea (Tethys Sea). At that time, Tibet, Qinghai, western and central Yunnan, and western Guizhou were all Wang Yang Sea. Western Hubei is a huge bay protruding eastward in the ancient land, extending to the middle of the Three Gorges of the Yangtze River today. The southern half of the middle and lower reaches of the Yangtze River is also submerged at the bottom of the sea, and the northern part of the middle and lower reaches of North China and Northwest China and the eastern part of Eurasia are relatively high. Indosinian orogeny occurred at the end of Triassic1-800 million years ago. At that time, Kunlun Mountain, Kekexili Mountain, bayan har Mountain and Hengduan Mountain began to appear, the southern half of the middle reaches of the Yangtze River rose to land, and the Yunnan-Guizhou Plateau began to appear. Between Hengduan Mountains, Qinling Mountains and Yunnan-Guizhou Plateau, fault basins and depressions are formed. At the same time, Yunmengze, Xichang Lake and Dianhu Lake are connected in series, flowing from east to west through the Nanjian Strait in western Yunnan and flowing into the Mediterranean Sea, which is opposite to the current direction of the Yangtze River.
Today, the formation of the Yangtze River originated from the Yanshan Movement of Jurassic10.40 billion years ago, and Tanggula Mountain was formed in the Yangtze River. The Qinghai-Tibet Plateau rises slowly, forming many mountains, deep valleys, depressions and rift valleys. Dabie Mountain and Wushan Uplift between Sichuan and Hubei in the middle and lower reaches of the Yangtze River, Sichuan Basin depression, and the ancient Mediterranean further retreated westward. /kloc-Cretaceous 0/0 billion years ago. Sichuan basin rises slowly. With the continuous development of leveling, Yunmeng and Dongting basins are sinking. Eocene, 30-40 million years ago, the Himalayan movement was strong, the Qinghai-Tibet Plateau rose, the ancient Mediterranean disappeared, and the Yangtze River basin generally rose intermittently. Its rising degree is moderate in the east and severe in the west. The mountains on both sides of Jinsha River are raised, and the Qinghai-Tibet Plateau and Yunnan-Guizhou Plateau are obviously raised, and some fault basins are formed at the same time. Under the strong downward cutting of rivers, many deep and steep canyons appeared, and the water systems that originally flowed from north to south merged with each other and flowed eastward. The middle and lower reaches of the Yangtze River are slightly uplifted, forming middle and low hills, and the depressions sink into plains (such as the two lakes plain, Nanxiang plain, Duyang plain, Jiangsu and Anhui plain, etc.). ). By 3 million years ago, the Himalayas rose strongly and the western part of the Yangtze River basin rose further. The ancient Yangtze River, which extends from Hubei to the four major river basins, has accelerated its erosion, cut Wushan Mountain and connected the east and west ancient Yangtze River.
After the change of 1300 years, Chongming Island with an area of 1083km2 was formed at the entrance. Chongming Island divides the Yangtze River into a north branch and a south branch. The northern branch gradually silted up and shrank. The south branch is the main waterway of the Yangtze River runoff. The south branch is divided into south mouth and north mouth by Changxing Island near Wusongkou, and the south mouth is divided into south trough and north trough by Jiuduansha. The South Channel used to be the main channel of the Yangtze River, but in recent years, the main channel has gradually turned to the North Channel. The water depth at the top of the Yangtze estuary channel is generally about 6 m. The beach length less than 10m is about 40km in Beigang and 64km in Nangang.
Yangtze river tourist attractions the Yangtze river basin is rich in tourism resources. What are the tourist areas that have been formed? Zone one, zone seven? . That is, the main tourist routes of the Yangtze River, the Yangtze River Delta tourist area, the famous mountain scenic area in southern Anhui, the tourist area in northern Jiangxi, the tourist area in northwestern Hubei, the tourist area in northern Hunan, the tourist area in Chongqing and Sichuan, and the tourist area in northern Yunnan and northern Guizhou.
The tourist route of the main stream of the Yangtze River: only refers to the section from Chongqing to Shanghai, and there are many scenic spots in many towns along the way. For example, Jinyun Mountain, Nanbei Hot Springs and Fengdu in Chongqing? Ghost town? Shi Baozhai in Zhongxian and Zhangfei Temple in Yunyang. The Three Gorges of the Yangtze River is the most scenic tourist area on the main stream of the Yangtze River.
Yangtze River Delta tourist area: including Hangzhou West Lake, Taihu Lake Scenic Area, Shanghai, Nanjing and other big cities and Zhenjiang, Yangzhou, Wuxi, Suzhou, Changzhou, Jiaxing, Yixing and other small and medium-sized cities.
Famous Mountain Scenic Area in South Anhui: It is a tourist area with Huangshan Mountain and Jiuhua Mountain as the main landscapes, and also has the interest of gardens and temples. In the southeast of Guichi City, there are places of interest such as Zhoushan and Maanshan Caishiji.
The tourist areas in northern and western Jiangxi include Poyang Lake, Lushan Mountain, Jinggangshan Mountain and Sanqingshan Mountain, as well as famous cities such as Nanchang, Jingdezhen and Jiujiang.
Tourist areas in northwestern Hubei and southern Shaanxi: mainly distributed in the Hanjiang River Basin. There are many relics of Han and Three Kingdoms in Hanzhong area, such as Zhang Qian's tomb in Chenggu, Guhantai and Baijiangtai in Hanzhong, Wuhou Tomb and Wuhou Temple in Mianxian, and Sean Temple in Liuba.
Xiangxi Xiangbei Tourist Area: Xiangxi Tourist Area mainly includes Zhangjiajie, Suoxiyu, Tianzi Mountain and Wuling.
Chongqing Sichuan Tourist Area: Chengdu is the center of Sichuan, and Dujiangyan, Qingcheng Mountain and Xindu Baoguang Temple are in the north. There are Emei Mountain, Leshan Giant Buddha and Minjiang Small Three Gorges in the south. There is Cuiping Mountain in Yibin, southern Sichuan; Zhongshan, Luzhou City.
Tourist areas in northern Yunnan and northern Guizhou: tourist areas should be located on both sides of Jinsha River and cities such as Kunming, Guiyang and Zunyi. Are there deep mountain canyons on both sides of Jinsha River? Animal and plant kingdom? This is an important field of scientific research. Lijiang and Lugu Lake, famous Naxi cities? Daughter country? .
Ningshan county Nanmengxi Natural Scenic Area
Nanmengxi is hidden in the hinterland (xigou, Dayangou, Shaping Village, Jiangkou Town, ningshan county), southwest of Xi 1 14km, west of National Highway 2 10/047km, 45km away from the exit of Xihan Expressway, with a main stream of 8km long and a total area of 12km2. There are musk deer, muntjac, bear, golden pheasant, pheasant, wolf, leopard, antelope, deer, Mayang, giant salamander, porcupine and other rare wild animals. Among them, there are more than 20 thousand golden pheasants with great aesthetic appreciation value in the area. There are Dalbergia odorifera, Liquidambar formosana, wild Phalaenopsis, woody jasmine, man-eating flowers, wild tea trees, wild magnolia, vine papaya, Ziziphus jujuba peel, wild Eucommia ulmoides, yew, Yingchun, Asarum, bitter bamboo and other plants; There are 4 beacon towers, 90 ancient trees, and strange mountains, caves, flowers, herbs, rocks, ancient trees, strange trees, waterfalls, strange cliffs, strange ponds, canyons, bamboo gardens and other landscapes are dotted. There are 100 registered villagers, and the area is uninhabited.
The Yangtze River is rich in natural resources, animals and aquatic life, and the ecological types of water areas are diverse. It plays an important role in promoting the economic and social development of the Yangtze River fishery and even the areas along the Yangtze River, maintaining the ecological balance and biodiversity in the Yangtze River basin, and ensuring the national ecological security. According to incomplete statistics, there are more than 370 species of fish, 220 species of benthos and hundreds of other aquatic plants in the Yangtze River Basin. The Yangtze River basin is an important habitat and breeding ground for a variety of rare and endangered aquatic wild animals in China, including baiji, Chinese sturgeon, sturgeon, finless porpoise, giant salamander and mullet, among which baiji, sturgeon, Danhu and mullet are endemic to the Yangtze River and have special scientific reference value in ecological evolution, military bionics and archaeological research. With the rapid economic and social development and increasing population in the Yangtze River basin, the aquatic biological resources and ecological environment in the Yangtze River are facing many threats, the aquatic biological resources are seriously declining, and the aquatic ecology is deteriorating and showing a trend of desertification.
Look at the history of the formation of the Yangtze River:
1. The formation and development history of tea culture
2. Overview of English-speaking countries: the formation history of Britain
3. The seventh grade history volume I Yangtze River all-round learning plan answers
4. The seventh grade history textbook answer-Yangtze River all-round learning plan
5. The answer to the first volume of the history of the Yangtze River in grade seven is 20 17.