Baikal is an inland freshwater lake, more than 2,000 kilometers away. Why are there marine life? It's been a long time today

As we all know, our country was in a leading position in the world in ancient times, and the land area at this time was also larger than that of China today. In ancient times, Lake Baikal still belonged to our country's territory, and it was called the "North Sea" at that time, but later, due to a series of reasons, we lost the ownership of this lake.

Today's Lake Baikal, in the south of Eastern Siberia in Russia, is the seventh largest lake in the world, but its depth is the first in the world. The reason for this is due to the movement of the earth's crust, and it is also because of this situation that the lake Baikal has the largest freshwater storage in the world. And after investigation and survey, it was found that the freshwater resources here account for 20% of the world's total, and there are still many marine creatures in the lake?

Scientists have summed up three reasons. The first is that Lake Baikal passes through the movement of plates, causing the ocean next to the Arctic Ocean and the Arctic Ocean to split, and then the fresh water in Lake Baikal, which stores a huge amount of fresh water, keeps flowing into it. Inside, with the passage of time, the salt content in the seawater slowly decreased, and these creatures that existed in the ocean gradually adapted to the environment here.

The second is that the source of Lake Baikal is the "External Baikal Sea", which eventually led to the situation where marine life lived here. In fact, it is not much different from the first situation. The third is that people think that the predecessor of Lake Baikal was In the outflow lake, at this time, many different rivers intersected and flowed to the Arctic Ocean channel, so this was the only way for marine life to continue to survive in the past. Finally, these fishes also slowly adapted to the freshwater environment.