Why do oceans rise and fall? What caused it?

The earth is a beautiful life planet, but also a huge water polo. The surface area of 7 1% is ocean, and water is the source of life. It is because of the existence of the ocean that early life was born on the earth 4 billion years ago. The ocean provides a hotbed for the birth of life, so water occupies a very large proportion in the composition of life on earth. For example, 70% of substances in human tissues are also water, not only for humans, but also for most other organisms.

This ratio is very similar to the ocean area of 765438+ 0% of the earth's surface, which may be closely related. It's just that we don't know much about life and the ocean, and we haven't found the relationship between them on the road of life evolution.

There are too many mysteries in the ocean, one of which is the fluctuation of tides. I believe that friends who live by the sea will often see the ebb and flow of the tide. Due to the lack of scientific knowledge, the ancients were superstitious about the ebb and flow of the ocean and thought that Poseidon was angry.

When mankind entered the era of science and technology, and had some knowledge of nature and everything in the universe, we began to study and explore the ebb and flow of the ocean and finally found the answer behind it. Then why does the ocean rise and fall? What caused it?

When we talk about the ebb and flow of tides, we think of tidal force. Some people may think that only the earth exists in tidal force. But in fact, any rotating celestial body will have tidal force, Venus will have tidal force, and Mars will also have tidal force. It is a function of gravity, and any celestial body will be influenced by other celestial bodies besides its own gravity.

The largest celestial body in the solar system is the sun, whose mass accounts for 99.86% of the whole solar system, so its gravity is very strong, which can affect eight planets, so every planet will be influenced by the tidal force of the sun. If there is no moon with a very large mass around the earth, then the tidal force of the earth will be provided by the sun.

However, because the mass of the moon is very large, and it is very close to the earth, the main source of the earth's tidal force is the moon, and the tidal change of the ocean is due to the existence of tidal force, and the so-called tidal force is gravity. The existence of gravity leads to the phenomenon of ebb and flow of tides. The reason why the moon revolves around the earth is that the moon is attracted by the earth's gravity, and the earth will be attracted by the moon's gravity, but the gravity generated by the moon is very small, and the tidal force is realized, so there is the fluctuation of tides.

The attraction of the moon to the earth by virtue of its own mass advantage has brought the phenomenon of ebb and flow to the earth's oceans, so how is it realized? As we all know, because the moon is too massive, its rotation period is the same as that of period of revolution, so the moon always faces the earth only once.

The gravity on the side close to the moon is greater than that on the side facing away from the moon, so the seawater facing the moon will form a high tide phenomenon under the drag of tidal force, while the seawater leaning towards the moon will appear a low tide phenomenon under the action of tidal force.

Some people may ask: since the ebb and flow of the earth is closely related to the moon, if the moon is gone, will there be ebb and flow? Some people may think that the tidal force of the earth is caused by the moon. Once there is no moon, there will be no ebb and flow of the earth. Is that really the case? Of course not.

In fact, the tidal force of the earth is produced by the joint action of the sun and the moon, but the force of the moon is much greater than that of the sun, so the main source of the tidal force of the earth is the moon. If the moon disappears, there will still be tidal force on the earth. At this time, tidal force was mainly influenced by the sun. Of course, compared with the moon in the past, tidal force is much weaker, and the ebb and flow of tides will still exist, but the time and amplitude will change obviously, which is much weaker than now.

It can be seen that the moon has a great influence on the earth. In fact, the existence of the moon not only brings a very obvious tidal force to the earth, but also brings the fluctuation of tides. Its more important role is to maintain the ecological stability of the earth. Once the moon disappears, the ecological and structural stability of the earth will change greatly.

If there were no moon, the earth wouldn't run like this. Its rotation speed will be much faster than now, and its revolution speed may also be faster than now. It is said that when the earth was formed, there were only a few hours in a day. Later, it was because of the existence of the moon that the rotation of the earth gradually slowed down.

The slow rotation speed of the earth is more conducive to the formation of stable ecology and the birth and continuation of life. Without the traction of the moon on the earth, it is still unknown whether life was born and continued. You should know that Venus is the sister planet of the earth, its mass and volume are very similar to that of the earth, and it is also a planet in the livable zone.

Theoretically speaking, Venus should also be a beautiful life planet like the earth. But it turns out that Venus is a purgatory planet with a surface temperature of over 460 degrees Celsius. The reason for this huge contrast is that scientists speculate that this may be related to the fact that Venus does not have a huge satellite like the moon. You know, Venus has no satellites, so its tidal force mainly comes from the sun.

We can imagine that the sun has become the tidal force source of Venus, which is not a good thing. Therefore, Venus' rotation period is 243 Earth days, which is much slower than the Earth's, while Venus' period of revolution is about 225 days, and its rotation time is longer than the revolution time. Even more incredible, Venus is the only big planet in the solar system that rotates in the opposite direction.

On other planets, the sun rises in the east and sets in the west, while on Venus, the sun rises in the west and sets in the east. When people are in conflict and can never be reconciled, they often say: I will forgive you unless the sun rises in the west. This sentence is to tell you that you will never be forgiven, because it is impossible for the sun to rise in the west on earth.

Venus's abnormal rotation is probably related to its lack of a large satellite for gravitational traction adjustment, so it has become a purgatory planet, while the earth has become a life planet. After reading these, I believe everyone understands the importance of the moon to the earth and human beings. Protecting the moon is an important responsibility if we want to live stably and safely on the earth.

Even in the future, when mankind has more powerful space power and can freely develop the moon, we need to develop the moon in a planned way instead of completely controlling it. You know, once the moon loses a lot of matter and its mass becomes smaller, its traction on the earth will be weakened and its tidal force will be greatly weakened. This will have a great impact on the earth's ecology, and may lead to great geological changes, thus bringing disaster to the earth.

Little friends, what do you think of this? Welcome everyone to leave a message below to discuss and express their views and opinions.