What is the origin of Japan?

In academic circles, there are two theories about the origin of Japan:

1, the first is the "replacement theory".

Japanese scholars believe that the aborigines of the Japanese archipelago in the rope-grain era were Ainu people. Later, for some unknown reason, the aborigines were expelled to the north by a large number of foreigners and became ethnic minorities. This situation is very similar to the history of Native American "Indians" being driven away by immigrants.

2. There is also a saying that it is "half-blood theory".

In other words, today's Japanese are the hybrids of Japanese aborigines, China people and foreigners who migrated from Nanyang Island, thus forming the Japanese in the modern sense. This statement is the mainstream of academic circles now.

Topography of Japan:

Japan is a mountainous island country. Mountains are distributed in the center of Japan in the form of ridges, which divide Japan's territory into one side of the Pacific Ocean and one side of the Sea of Japan. Mountains and hills account for 765,438+0% of the total area, and most of them are volcanoes. The forest coverage rate is as high as 67%. Mount Fuji is the highest mountain in Japan, with an altitude of 3,776 meters, and is honored as the "sacred mountain" by the Japanese.

Japan is located at the extinction boundary of the Asia-Europe plate and the Pacific plate, that is, the circum-Pacific volcanic seismic belt, which is a part of the western Pacific island arc-coastal mountains-trench combination, with frequent volcanic and seismic activities. 68% of the country is mountainous, and one tenth of the world's volcanoes are located in Japan. According to statistics, more than 20% of all earthquakes of magnitude 6 or above in the world occurred in Japan. On average, there will be 1 earthquake in 3 years.

The plains of Japan are mainly distributed in the coastal areas of the lower reaches of rivers, mostly alluvial plains, with a small scale. The larger plains are Shikai Plain, Yuehou Plain, Houwei Plain and Shi Sheng Plain, the largest of which is Kanto Plain. Japan's plain area is small, the cultivated land is very limited, and the population physiological density is as high as 2924 people/square kilometer, ranking 26th in the world.

Reference to the above content: Baidu Encyclopedia-Japan