Does the Yangtze River Delta belong to the topographic changes caused by human activities?

No. The Yangtze River Delta refers to the alluvial plain formed by the sediment of the Yangtze River east of Zhenjiang and Yangzhou, located in the southeast of Jiangsu Province, Shanghai and the Hangjiahu area of Zhejiang Province.

The apex of the Yangtze River Delta is near Zhenzhou Town, Yizheng City, with Yangzhou, Jiangdu, Taizhou, Hai'an, and Zhangcha as its northern boundary, Zhenjiang, Ningzhen Mountains, the eastern foot of Maoshan Mountain, the northern foot of Tianmu Mountain and the northern shore of Hangzhou Bay as the western and southern boundaries, and the Yellow Sea and the East China Sea in the east, covering an area of 40,000 square kilometers, making it the largest estuarine delta in China.

Among them, the territory of Jiangsu Province is about 10,000 square kilometers, and the ground elevation is 2.5 meters.

The delta basement is part of the Yangtze quasi-platform, and the Himalayan tectonic movement interrupts the subsidence. During the Quaternary neotectonic movement, the earth's crust and sea level rose and fell frequently, and after the last sea transgression, the sediment carried by the Yangtze River continued to be deposited, and a delta began to develop in the estuary.

Due to the Coriolis force, the main river continues to deviate to the right, causing the estuary sand group to merge into the north bank in turn. The sand bars and sandbar groups formed in the Hongqiao period, the Huangqiao period, the Jinsha period, the Haimen period and the Beisha period formed the Hanjiang, Taixing, Jingjiang, Rugao, Nantong, Haimen and Qidong counties on the north bank of the Yangtze River today. At present, the sand islands of Chongming, Changxing, and Hengsha near the mouth of the river will also be incorporated into the north shore according to this law.

The Sha Tsui at the mouth of the river is also extended simultaneously.

The formation of the Yangtze River Delta is the result of the sediment carried by the Yangtze River water deposited in the estuary area and the erosion of marine tides (or currents) in the estuarine area.

The sediment carried by the Yangtze River water will accumulate at a faster rate than the rate of seawater erosion in the estuary area, which will form a sandbar in the estuary area, and then expand in scale and connect with the land, forming a delta landform.

The same is true of the formation of the Yellow River Delta, which is still significantly larger in size.

The location advantages of the Yangtze River Delta are: located in the lower reaches of the Yangtze River, connecting the coastal and inland areas, bordering the Yellow Sea and the East China Sea, and at the intersection of the rivers and seas, it is the center of China's north-south maritime shipping, leading to all parts of the world through ocean routes, and the Beijing-Hangzhou Canal has communicated the economic ties between the Yangtze River Delta and the northern region in history.

The Yangtze River Delta region has been geographically close and close to each other since ancient times. On the new voyage of higher-quality integrated development led by the national strategy, more than 200 million "Yangtze River Delta people", including 70 million sons and daughters of Jianghuai, are setting sail and standing at the forefront of the tide to build a modern and beautiful new home that shares happiness and harmony with one party.

It is bordered by the East China Sea and the Yellow Sea in the east, where rivers and seas meet.

Location: The starting point of the river ** waterway, the middle section of the north and south coastlines.

It can be traced along the Yangtze River to the inland areas, and its superiority is that it can trade with the coastal areas of the north and south and the countries of the world.

The narrative about the Yangtze River Delta region is wrong (c).

a. Shanghai-Nanjing-Hangzhou Industrial Base is the largest comprehensive industrial base in the country and the core area with the strongest economic strength in China, so A is correct;

b. The Yangtze River Delta region, relying on its superior geographical location and convenient water and land transportation, vigorously develops an export-oriented economy, so B is correct;

c. There are many township enterprises in the southern part of Jiangsu Province, which are known as the "cradle of township enterprises", so C is incorrect;

d. The industrial centers of Shanghai-Nanjing-Hangzhou Industrial Base mainly include Shanghai, Nanjing and Hangzhou, so D is correct