Where does the water on earth come from? Life cannot be separated from water. The Earth is the only Earth-like planet with liquid water. So where does the earth's water come from? People still don't have a definite answer. What is certain is that when the earth was still in the magma sea stage, liquid water could not exist on the surface due to the high temperature, so the earth's oceans should have formed after the earth cooled. When the magma sea cools, volatile substances such as water and carbon dioxide precipitate out from the magma sea, but fail to leave the earth due to gravity, thus forming the earth's original atmosphere. It can also be explained in this way that after the magma sea cools, the magma produced by the melting of the mantle will emit volatile gases on the surface, and when these volatile gases condense, they can produce water. Some people even speculated that water-containing comets in the outer solar system might have brought water to Earth. The solar wind sweeps the earth strongly, carrying away the earth's atmosphere and water. Although all of these processes may produce water on the earth, long-term preservation of water requires some special conditions, such as the earth's gravity that suppresses water escape. The earth's magnetic field is also a major contributor to protecting water. The strong solar wind will take away the atmosphere and water on the planet. However, because the earth's magnetic field effectively resists the invasion of the solar wind, only a very small amount of water and atmosphere escape in the north and south poles, forming a beautiful and changeable aurora. In this way, although the earth's core that generates the earth's magnetic field is at a depth of about 2900 kilometers below our feet, it silently protects the earth's water source and creates necessary living conditions for earth's creatures. In contrast, Mars, due to the lack of protection from a magnetic field, although it was once "wide" in the past and had a vast ocean on its surface, is now barren and desolate.
Where does the water on earth come from?
This paper discusses the source of Earth's water, but there is no definite answer at present. It is known that volatile matter precipitation from the magma sea during cooling or mantle exhaust can form primitive water. There is also speculation that it is brought by water-containing comets in the outer solar system; it is also mentioned that the preservation of water requires gravity, magnetic field and other conditions, compared with the lack of water on Mars due to lack of magnetic field.
