What did the ancients mean when they said that relying on mountains to eat mountains and relying on water to eat water?

This old saying is about the way of life of the ancients. The livelihood of ancient people mainly depended on the natural environment. Three tenths of their lives depend on mountains, six tenths on water and one tenth on fields.

The actual surface area of the earth is about 5 1 100 million square kilometers. The ocean accounts for 71%; Land accounts for 29%, and the ratio of land to sea is about seven to three.

The earth's surface is divided by the mainland into vast interconnected waters called oceans, with a total area of about 360 million square kilometers, accounting for about 7 1% of the earth's surface area, with an average water depth of about 3795 meters. The ocean contains more than1350 million cubic kilometers of water, accounting for about 97% of the total water of the earth, and only 2% is available for human consumption.

The four oceans of the earth are the Pacific Ocean, the Atlantic Ocean, the Indian Ocean and the Arctic Ocean, and most of them are bounded by land and seabed topographic lines. So far, only 5% of the seabed has been explored by humans, and 95% of the seabed is unknown.

Extended data

The cause of the formation of the ocean:

About 5 billion years ago, some large and small nebulae separated from the solar nebula. They revolve around the sun while rotating. In the process of movement, they collided with each other, and some lumps combined with each other, from small to large, and gradually became the original earth.

During the collision of nebula clusters, they shrink sharply under the action of gravity, and the radioactive elements in them degenerate, which makes the primitive earth heat up continuously. When the internal temperature reaches high enough, underground substances, including iron and nickel, begin to melt.

Under the action of gravity, the weight sinks and tends to concentrate in the center of the earth, forming the core; Lighter ones float to form the crust and mantle. At high temperature, the water inside evaporates, rushes out with the gas and rises into the air. But because of gravity, it won't run away, it will only turn around the earth and become a circle of air and water.