The formation of the earth 5, how the earth was formed

Before the formation of the earth, there were many asteroids in the universe revolving around the sun, and these planets collided with each other to form the primitive earth, when the earth was still a hot fireball, and as the collision gradually decreased, the earth began to cool slowly from the outside to the inside, producing a thin layer of hard shell - the earth's crust, at this time the earth was still in a hot state. A large amount of gas is ejected from the inside of the earth, which carries a large amount of water vapor, which forms a circle of atmosphere surrounded by the periphery of the earth, the position of the earth from the sun is not too close to the water vapor is evaporated by the sun, and the size of the earth itself has enough gravity to pull the atmosphere, so the earth will have a unique atmospheric environment, and the atmosphere begins to rain after the formation, and the original ocean is formed.

About 4.7 billion years ago, dust gathered in the universe to form the Earth and the other planets of the solar system in which it is located. At that time, the air did not contain oxygen, but contained a lot of carbon dioxide (carbon dioxide gas) and nitrogen.

Originally, the Earth was small, but it continued to increase in size due to the constant impact of small stars in the universe. And when it hits, the energy gathers, the temperature rises, and eventually melts into a liquid.

Soon, the number of star impacts decreased, and the temperature of the Earth's surface decreased, forming the Earth's crust. This is the surface of the earth today. However, magma in the Earth's interior is constantly erupting, forming a large number of volcanoes. The water vapor in the volcanic ash cools and condenses into water, which forms the ocean. Formation of balls.

The formation of the primitive earth.

Before the formation of the earth, there were many asteroids in the universe revolving around the sun, and these planets collided with each other to form the primitive earth, which was still a hot fireball at that time.

As the collisions gradually decreased, the earth began to slowly cool from the outside in, creating a thin layer of hard crust - the earth's crust, and the interior of the earth was still in a hot state.

Formation of the atmosphere and oceans.

A large amount of gas is ejected from the inside of the earth, which carries a large amount of water vapor, which forms a circle of atmosphere surrounded by the periphery of the earth, the position of the earth from the sun is not too close to the water vapor is evaporated by the sun, and the size of the earth itself has enough gravity to pull the atmosphere, so the earth will have a unique atmospheric environment, and the atmosphere begins to rain after the formation, and the original ocean is formed.

The universe is big**.

The Earth is diverged from nebulae.

The Earth is diverged from nebulae. In the beginning, it was just an aggregate of some cosmic solid particles. In the process of movement, it continues to absorb the cosmic particles around it, and finally condenses into a sphere.

The material that formed the primitive Earth was mainly the primordial material of the nebula disk, the composition of which mainly consists of hydrogen and helium, which account for about 98% of the total mass.

In addition, there is solid dust and material thrown out during the early shrinkage evolution phase of the sun. In the process of the formation of the earth, due to the differentiation of matter, light matter was constantly separated from volatile substances such as hydrogen and helium, and was carried to the outside of the solar system by the sun's light pressure and the material thrown by the sun.

Although there is still a great deal of speculation about the way in which the primitive Earth was formed, most researchers believe that after the formation of the above-mentioned nebula disk, due to the action of gravity and the instability of gravity, the material in the nebula disk, including the dust layer, formed many protoasteroids or stars due to collision and accretion, and then gradually evolved and gathered into planets, and the earth was born in it. According to preliminary estimates, it took about 10 million to 100 million years for the formation of the Earth.

Introduction to the Earth's Inner Knotted Deities: <>

The earth's crust is not very thick in terms of the size of the entire Earth. The average thickness of the earth's crust is 17 km globally, 33 km in continental parts, and 60 to 70 km in higher altitude areas such as plateaus and mountains, such as the Tibetan Plateau. The oceanic crust is thin, generally only 6 km thick on average.

There is an asthenosphere in the upper part of the upper mantle, which extends from about 70 km to about 250 km, which is characterized by the appearance of a low-velocity zone of ** waves. The average density of the lower mantle is due to the strong intraterrestrial pressure in the upper mantle, which causes the decomposition of olivine and other minerals in the upper mantle into simple oxides such as FeO, Mgo, SiO2 and Al2O3.

It is basically the same as all planets