Where does the sea in the changing field refer to? What is its origin?

There is no exact location, but the approximate scope should be the East China Sea. Magu description:? Ma Gu said the cloud; Self-waiter; Three mulberry gardens have been seen in the East China Sea. ? After several changes, it became a sea change field. Later, people compared Sang Hai Heaven to the great change or extremely rapid change of things in the world.

Legend has it that the immortal king of the Eastern Han Dynasty met the immortal Magu when he passed by his apprentice's house, only to find out that he was his own sister, who practiced Taoism in Guyushan in her early years. But thousands of years later, she will always be a girl in her twenties and eighties with long hair and beautiful clothes, so she got together for a family dinner and mentioned that she had seen the East China Sea turn into a mulberry field three times to show how long she had experienced.

Anyone who has studied geography knows that, literally speaking, the passage of time means that the sea has turned into land, and the land has turned into the sea, because the earth's crust has changed, sometimes rising and sometimes falling. When the earth's crust rises, the seabed will be exposed, and sand will pile up into mountains and eventually become a continent. On the contrary, if the earth's crust sinks, it will form a trench and eventually become an ocean. This is a recurring natural law. The natural phenomenon of changing sea into fields is very common on the earth, but no one can witness this spectacle with his own eyes.

It is the magical natural force of this kind of event change that makes people feel that the world is changeable. As the saying goes, if there is love in the world, the sky is old and the world is vicissitudes. There is no absolute between heaven and earth, but in our eyes, the sea and mulberry fields are not eternal, and the quantity and the change of quantity have formed a qualitative change. After a long, long time, this highland where we are now is likely to become the sea of Wang Yang. The main reason for the vicissitudes of life is climate change. After the temperature drops, the water evaporated from the ocean will form glaciers on the land, and the shallow sea will gradually become land due to the gradual decrease of seawater. On the contrary, if the temperature rises, the glaciers on the mainland will melt into water, and human land will gradually decrease. Therefore, the problem of global warming is worth pondering.