How is the earth made? 5. How did the earth come about?

Once upon a time, space was filled with clouds of countless particles of matter called "nebulae". Due to the gravitational attraction, particles of matter attract each other. Gravitational particles continue to attract smaller particles around them, and they become larger and larger, forming thousands of huge gravitational centers.

These gravitational centers eventually become stars. The sun is one of them. Instead of being attracted to the center of gravity, some particles circle around the large center of gravity and form small centers of gravity, which eventually coalesce into planets.

The Earth is one of them.

This was an important era for the formation of iron ore, and the lowest primitive life began to emerge. 2.4 billion years ago, 600 million years ago, the Proterozoic. At this time, most of the earth was still hidden by the ocean. In the late period, large swaths of land appeared on Earth.

The Earth is a member of the solar system. The solar system family consists of the Sun, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, and 500,000 asteroids, moons, and comets. The Sun is the parent of the solar system.

Before the formation of the solar system, it was a nebula made up of red-hot gas, which rotated when the gas cooled and caused contraction. Due to gravity, the gas and wind wind and grass contract and rotate faster, and the nebula becomes a flat disk. We know that the washing machine used to wash clothes in modern families has a dehydrator, put wet clothes in it, and the dehydrator rotates quickly, and the moisture in the clothes will be "thrown" out, and the wet clothes become dry clothes.

The force that throws water out is the force generated by the water droplets leaving the center when they move in a circular motion, which is called centrifugal force. In the same way, when a rotating nebula shrinks and rotates, and the centrifugal force of the surrounding matter exceeds the centrifugal pull of the center on it, it separates a ring. And just like that, one ring after another was created.

Eventually, the central part becomes the sun, and the surrounding rings become planets, one of which is the Earth, which was created four or five billion years ago.

This is a scientific hypothesis, a doctrine put forward by the German philosopher Immanuel Kant and the French mathematician Laplace in the 18th century. In 1944, the German physicist Weizak developed this theory.

Research on the origin of the solar system and the formation of the Earth continues and continues to improve. Nevertheless, the earth is the mother of our humanity and nurtures us to grow up. We humans should know it, understand it, and even if one day, human beings move to other planets, we will always miss it.

The solar system is actually made up of eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune, while Pluto has been classified as a terrestrial planet. Among the many theories about the formation of the earth, the universe is the most recognized. The earth was created by collisions in the universe, and later due to the gravitational force in the solar system, the earth orbited around a certain orbit at a certain speed, and then became the earth.

The question of the origin of the earth has likewise had been subject to a variety of theories since the mid-18th century. The prevailing belief is that about 4.6 billion years ago, the primordial Earth began to diverge from the solar nebula, with a low temperature, a blend of light and heavy elements, and no hierarchical structure. Once the primitive Earth was formed, it was conducive to the continued accretion of solar nebulae by increasing volume and mass, and at the same time increasing temperature due to gravitational differentiation and radioactive element metamorphosis.

When the internal material of the primitive earth warms up to a molten state, the ferrophilic elements with large specific gravity accelerate to sink to the center of the earth and become the core of iron and nickel, and the lithophilic elements with small specific gravity float up to form the mantle and crust, and the lighter liquid and gaseous components overflow the surface through volcanic eruptions to form the original hydrosphere and atmosphere. Since then, Planet Earth has begun the evolutionary history of interactions between different spheres and frequent material-energy exchanges.

Now the most authoritative statement is: in the early days of the formation of the solar system, more than 99% of the matter converged to the center to become the sun, and there are some scattered material fragments around the sun, after a long period of collision and gravitational action, the scattered fragments gradually converged into nine planets, but the earth at that time was just a chaotic material, and after hundreds of thousands of years, the material gradually cooled and solidified, forming the initial form of the earth, and then after hundreds of thousands of years, due to the gravitational effect of the earth, The gas produced by the chemical reaction inside the earth is ejected and stored around the earth to form an atmosphere, and is synthesized into water by hydrogen and oxygen, and then through the energy radiation of the sun, the electric field, magnetic field and suitable living environment of the earth itself, organic matter is produced from the water, which is the ancestor of all life.

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 original earth. 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 that revolved around the sun, and these planets collided with each other to form the primitive earth, which was still a big fireball of moxibustion 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.

Still a mystery. I think the theory of the universe is more reliable to form the solar system.

It is formed by the condensation of the dust produced by the universe.