What are some hypotheses about where water comes from on Earth?

Where does the water on Earth come from? After continuous exploration and research, scientists have come to several conclusions.

There are generally 2 theories about whose ** is on the planet.

The "Exogenous Theory", as the name suggests, holds that the water on Earth comes from outside the Earth. Mainly comets and water-rich asteroids that carry a lot of ice components. Comets, which are made up of water and interstellar dust, bring a lot of water with a comet hitting the Earth.

Some water-rich asteroids descend on the earth to become meteorites, which also contain a certain amount of water, generally, some can reach more than 10%, of which carbonaceous chondrites contain more water. Chondrites are one of the most common meteorites in the solar system, accounting for about 86% of all meteorites. For this reason, some scientists believe that it is extraterrestrial bodies such as comets and asteroids that bring their frozen water resources into the Earth's environment when they hit the Earth.

"Self-origin theory" holds that the water on the earth comes from the earth itself, and the earth is formed by the fractionation, collapse, and condensation of the original sun, nebula, gas, and dust. When the earth originated, the material that formed the earth contained water. At the time of the formation of the earth, the temperature was very high, and water was either present in the earth's crust, mantle, or gaseous state in the earth's atmosphere under high pressure.

Later, as the temperature dropped, the water in the Earth's atmosphere condensed and fell to the ground. The water in the magma is also released into the atmosphere and to the surface as a result of volcanic eruptions and geological activity. The water that collects into the low-lying areas of the earth's surface forms rivers, lakes, and oceans.

1. The most representative of the water on the earth are the "exogenous theory" and the "self-source theory".

2. The autologous theory holds that when the earth originated, the magma deep underground contained abundant water, and under the right conditions, the water in these rocks would be released. In the first few hundred million years after the formation of the earth, due to the thin crust and the continuous bombardment of the earth's surface by small celestial bodies, molten magma in the mantle was prone to upwelling and erupting, so the earth at that time was full of fire. The magma is accompanied by a large amount of water vapor and carbon dioxide, which rises into the air and envelops the earth.

Water vapor forms clouds, which produce rainfall. After a long period of rainfall, in the low-lying areas of the original crust, water continues to accumulate, forming the most primitive ocean. The water of the pristine sea was only slightly salty, and only later did the salinity gradually increase.

It was through the gradual increase in water volume and salinity, as well as the vicissitudes of geological history, that the pristine ocean gradually formed the ocean of today.

3. The exogenous theory holds that the composition of comets that collide with the earth and meteorites that fall to the earth contains a certain amount of water, generally as high as 10% or more. Among them, carbonaceous chondrites have more water. Chondrites are one of the most common meteorites in the solar system, accounting for about 86% of all meteorites.

Meteorites that descend on Earth carry moisture to Earth. In addition, some people believe that the solar wind reaches the upper layers of the earth's atmosphere, bringing a large number of atomic nuclei such as hydrogen, carbon, and oxygen nuclei, which combine with electrons in the atmosphere to form hydrogen atoms, carbon atoms, oxygen atoms, etc. It is then transformed into water molecules through different chemical reactions.

a.The Initial Existence Theory holds that water already existed in the Initial Nebula.

b.Solar radiation theory holds that water is produced by solar radiation striking the Earth's atmosphere.

c.According to the volcanic rock, it is believed that the water is produced by the weathering and exhaust of the volcanic rock.

d.The ice meteorite theory is that the water was brought to Earth by an ice meteorite in the space that left the front chamber.

Correct Answer: Solar radiation theory holds that water is produced by solar radiation impacting the Earth's atmosphere.

Looking at the Earth from space, it is a mostly blue sphere, and the blue part is water, and in the solar system, the Earth is the only celestial body with liquid water, so people can't help but ask: where does the water on Earth come from?

Earth, in fact, does not live up to his superficial appearance. The earth, in fact, does not live up to its name, its surface is about 100 million square kilometers, of which the land area accounts for the surface area of the earth, and the area of the ocean accounts for a real water ball. There are hundreds of millions of cubic meters of water on Earth.

Some scientists say that the solar wind causes the production of water, and that the earth's water is brought by the solar wind, and that it is the masterpiece of the solar wind, and the scientist who first put forward this idea was Toverly. He believed that the solar wind is the stream of particles projected outward from the outer atmosphere of the Sun, and that electrons and hydrogen nuclei - protons are the main components of it. Based on calculations, Toverli has come up with a theory that the total amount of hydrogen that the Earth has absorbed from the solar wind from the formation of the Earth to the present day has reached 1,023 grams.

We know that hydrogen and oxygen combine to produce water. If you combine all this hydrogen with the oxygen on the earth, you can produce 1,024 grams of water, and the total amount of water on the earth is now 14.5 billion tons, which is very close to your number. What's more, the ratio of hydrogen to tritium content in Earth's water is 6700:

1. The hydrogen-tritium ratio on the surface of the sun is also very close, so Toverly thinks that according to these calculations and compositional comparisons, it can be fully shown that the earth's water comes from the solar wind.