The earth once rained for more than one million years. Will such weather still exist in the future?

2020-01-09 | Zhong Ming talks about science original |

Scientists have studied the origin of water on Earth, and the results show that in the early days of the earth, a heavy rain that lasted 1 million to 10 million years continued. This rain was part of the earth's early water.

Then the question comes, why did it rain so long in the early days of the earth, and why does it not rain so long now?

Why did it rain so long in the early days of the earth?

To understand why the earth has been raining for so long, we must first understand the environment of the early days of the earth.

About 4.6 billion years ago, there was a nebula with a diameter of about 2 light years near the position of the sun. These nebulae may be the product of the previous generation of supernova explosions.

Later, gravitational collapse occurred at a certain position in the nebula's matter, and the surrounding matter gradually gathered together under the action of gravity. The more the matter gathered, the greater the gravity at the center.The nebula matter around 2 light-years have gathered together to form a planet, which is the sun; the debris that forms the corners of the sun forms other celestial bodies in the solar system, such as the earth.

At the beginning of the formation of the earth, the temperature of matter was high, so the surface of the earth was molten. At this time, the water vapor was evaporated by the high temperature environment and ran into the atmosphere. The reason why the water vapor did not escape into the universe is because the earthGravity works.

In this way, a large number of water molecules on the earth exist in the form of water vapor in the earth's atmosphere.

Later, the earth's surface gradually cooled, and there were many dust-like condensation nuclei in the air, which allowed water vapor to condense around the condensation nuclei. As a result, the more water molecules on the condensation nuclei gathered, the more they converged to a certain extent.At that time, water droplets were formed. Because the water droplets have a certain weight, they fell onto the surface of the earth under the action of gravity, forming a heavy rain that lasted for millions or even millions of years.

Actually, the water we can see at present is only a part of this heavy rain, and a considerable part of the water molecules are condensed with minerals and locked into the crystal lattice of minerals.

Scientists have found that there is a large amount of water in the spinel olivine lattice, and this mineral is widely distributed in the upper and lower mantles. According to conservative estimates, the water molecules in the mineral crystal lattice are located.It is more than three times the total amount of water on the surface of the earth.

Why doesn't it rain that long now?

On earth, water in lakes and oceans will be evaporated into the air, and the molecules in the air follow the same four laws: at the same temperature and pressure, the number of arbitrary gas molecules in the same volume is the same.

We know that the earth ’s air contains 70% nitrogen and 21% oxygen. These materials have a smaller atomic number and lighter objects. Water molecules are composed of two hydrogen ions and one oxygen ion, which are higher than nitrogen molecules and oxygen.The molecular substance is lighter, so air filled with more water molecules can rise to a certain height.

After rising to a certain height, because the pressure becomes smaller, the water molecules will diffuse outward and the temperature will be lowered, that is, the water molecules will not rise infinitely, but will stay there after reaching a certain height..

If there are more water molecules, then clouds will form. If there are more water molecules, they will condense into rain and fall to the ground. In fact, this process is the same as the conditions for the early formation of rain on the earth.

Then the question comes, why isn't the earth raining so long now?

If you analyze it carefully, you may have guessed that the reason why the earth does not rain so long now is actually related to temperature.

We know that when the temperature reaches the boiling point of water, water will evaporate into the sky. In the early days of the earth, the temperature was very high, well over 100 degrees Celsius, and this high temperature situation has lasted for hundreds of millions of years,In the middle of the year, water on the earth cannot exist in liquid or solid form. It can only exist around the earth in the form of water vapor and wait for the temperature to drop.

At present, the temperature on the earth is far below the boiling point of water, so only a small amount of water exists around the earth in the form of water vapor, and most of it exists on the surface of the earth in the form of liquid water, so that the amount of rainfall and the duration,Are much smaller than early Earth.

If you want the earth to last another millions of years of heavy rain, then you must let the earth experience another high temperature melting state. If this happened, humanity may have already become extinct.

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