-
Anonymous users2024-02-15Origin and evolution.
The systematic scientific study of the origin and evolution of the earth began in the middle of the eighteenth century, and several theories have been put forward to this day. It is now popular to believe that the Earth, as a planet, originated from the primordial solar nebula 4.6 billion years ago.
Like other planets, it has undergone some common physical evolutionary processes such as accretion and collision. At the beginning of the formation of the earth's fetus, the temperature was low and there was no layered structure, but the temperature of the earth gradually increased due to the bombardment of meteorite materials, the heat caused by radioactive decay and the gravitational contraction of the primitive earth. As the temperature rises, the earth's internal materials become more and more plastic, and there is a phenomenon of local melting.
At this time, under the action of gravity, the differentiation of matter begins, the heavier material outside the earth gradually sinks, the lighter material inside the earth gradually rises, and some heavy elements (such as liquid iron) sink to the center of the earth, forming a denser core (the observation of ** waves shows that the outer core of the earth is liquid). The convection of matter was accompanied by large-scale chemical separation, and finally the Earth gradually formed the layers of the crust, mantle, and core that it has today.
In the early days of Earth's evolution, the primordial atmosphere escaped. With the recombination and differentiation of matter, various gases that were originally in the earth's interior rose to the surface through volcanic eruptions and other actions to become the second generation of the atmosphere, and later, due to the photosynthesis of green plants, it further developed into the modern atmosphere. On the other hand, the temperature of the Earth's interior increases, which vaporizes the crystalline water inside.
As the surface temperature gradually drops, the gaseous water condenses and rainfalls to the ground to form a hydrosphere. About.
Three or four billion years ago, single-celled life began to appear on the earth, and then gradually evolved into a variety of organisms, until advanced organisms such as humans constituted a biosphere.
-
Anonymous users2024-02-14This question is really big, but I have a simple method, you can know your answer by typing ** on the Internet, and this answer is the latest theory of the birth of the earth and the universe researched by the highest modern science and technology or scientific and technological personnel. Personally, I think this theory is nothing more than the separation of cells, a separation process. It's really hard for you to understand.
Everything in my brain is molecules, which can be infinitely large, infinitely small, and transcend thoughts. But you must not think wildly, otherwise thinking about multiple people, people around you, will make you think that you are unique.
-
Anonymous users2024-02-13Chalapras's nebula hypothesis.
-
Anonymous users2024-02-12I'm a simulated space, and in fact the Earth may not really exist.
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. >>>More
When a volcano erupts magma, it spreads to various places and gradually cools to form rocks, and sand, soil, and dust appear from continuous weathering. >>>More
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. >>>More
The other two said it well! Thermal support!
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, 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. >>>More