The ocean is the source of life, but there is still a difference between the sea and the ocean. The central part of the ocean is called the ocean, and the edge is the sea. The area of the sea is about 11% of the ocean, and the water depth is shallow, with an average depth ranging from a few meters to three thousand meters. How much do you know about the sea? There are a lot of interesting little knowledge about the sea. Let's explore it together!

In everyone's cognition, the sea is naturally blue, just like the sky is blue and the clouds are white, they are all products of nature. But if you look closely, you can see that the water is colorless and transparent. The reason why the sea looks blue from a distance is because of the depth of the seabed and the volume of the seawater. The depth of the ocean is very large, and the seabed does not have lighting tools like some technologies on land, so sometimes the seabed will be very dark. As you get closer and closer to the surface, the bottom becomes brighter and brighter, creating a bright night scene, like a dark blue sky. Therefore, in the eyes of people, the color of the sea is blue. This is why it is also seawater, the seawater in the hand and the seawater in the bottle are both transparent, while the seawater in the ocean is a kind of blue.

Sea water is the "hometown" of salt, and for good reason. In the early stage of the formation of the earth, all living objects are slowly germinating, and in the medium on which all kinds of life depend, the ocean is an excellent breeding ground for the growth of life. In the long geological period of the earth, the surface water at the beginning of the formation is all fresh water. Later, because the salt in the surface rocks was continuously eroded and eroded by the water, the water contained salt, and the salt-containing water continuously formed rivers and finally merged into the sea. For a long time, the water vapor keeps evaporating and leaving behind salt particles, and the salt accumulates more and more, and the sea water naturally becomes salty. After billions of years of cycling, most seawater is currently about 35% salty.

The ocean contains more than 1.35 billion cubic kilometers of water, accounting for about 97% of the total water on the earth, but the water that humans can drink is very limited. And with the continuous destruction of the ecological environment, it may be necessary to solve the problem of water scarcity through desalination in the near future.

The sea is also a veritable liquid mineral. Most of the elements in the world can be found in seawater. On average, every cubic kilometer of seawater contains 35.7 million tons of minerals. According to relevant detection results, the world's recoverable oil resources are about 300 billion tons, of which seabed reserves account for 130 billion tons. In addition to oil, another new energy, combustible ice located in the depths of the ocean, also has great potential value and can be used as an energy source for various means of transportation. At present, many countries have formulated corresponding mining and use plans. Let's look forward to it together.