Why does the earth have air? As the title suggests, thank you

It was formed slowly during the formation of the earth.

Because the earth has water and the sun!

The earth's air is formed by a lot of accidental factors. Because air is the name given to a combination of several gases. Secondly, due to the light mass of the gas and the existence of gravity, it is impossible for the gas to drift in space and can only attach to the surface of the planet, and there are trees on the earth that produce oxygen through photosynthesis, and photosynthesis requires water, sunlight, and carbon dioxide, which is not found on outer space planets.

Mainly because the earth is in the most habitable place, and the distance to the sun is just right.

Because the gravitational pull of the Earth is greater than that of other planets, and the various environments of the Earth, air is produced.

Because the earth has undergone hundreds of millions of years of changes, from the beginning of the barren to today's green ecology, this is the advantage of the earth, this is the reason why the earth has air.

Because the appearance of air on Earth is the result of natural evolution, this is not the case on other planets.

Everything in the world was the result of chance, and as a result, the Earth became the habitable planet known to people today. The main reason is the location of the earth and its own gravity.

The presence of air on the earth is determined by the size of the earth's gravitational orange. The reason for the formation of air composition is first of all the activities in the earth's interior, which produce water vapor, ammonia, carbon dioxide, etc. Then, the primordial organisms are produced, making the air composition gradual.

In particular, after the appearance of green plants, the current air composition was gradually formed.

Supplement: The Earth's atmosphere is composed of 77 percent nitrogen, 21 percent oxygen, trace amounts of argon, carbon dioxide, and water. When the Earth was first formed, there may have been a large amount of carbon dioxide in the atmosphere, most of which was combined into carbonate rocks, and a small part was dissolved into the ocean or consumed by living plants.

Plate tectonics and biological activities now sustain the constant flow of carbon dioxide from the atmosphere to other places and back again. The small amount of carbon dioxide that is stably present in the large circle is judged by the greenhouse effect.

Why is there no air on other planets? How is air on Earth formed?

Oxygen may not be common in the universe, but there is a long-term earth's atmosphere, and the stars that contain oxygen in it are indeed unique in the universe of everyone's cognitive ability at this stage.

The earth originally did not have oxygen, the earth 3.5 billion light years ago, it was a young earth, that is, life had just developed, and that era with a long history of Senji has now become the primeval era. In the first billion light-years of life, phycocyanobacteria, or blue-green algae, learned to harness the particularly colorful hydrogen found in water. They inhale water, swallow hydrogen, and excrete oxygen, a process that is now known as plant photosynthesis.

With the improvement of algae and green bacteria, everyone's earth is gradually flooded with oxygen.

Oxygen is harmful at the source.

When the world is gradually flooded with oxygen, it is felt that oxygen is a harmful microbiotic – and there are countless of them. Needle finger ignition is toxic to Pseudomonas aeruginosa. The way to kill invasive germs with low white blood cells in our body is actually to kill them with oxygen.

Oxygen is not what the students imagine to be as happy, and it is very likely that there is no <> for organisms that can gradually evolve and use oxygen

However, it is a terrifying object. Oxygen can mold unsalted butter and rust iron. Even the body's own tolerance to oxygen is also to a certain extent.

Under normal circumstances, the oxygen concentration in the cells of the human body is only about a quarter of that in the air, and once this concentration is exceeded, the body will be destroyed.

Benefits of oxygen. Oxygen has an incomparable advantage, allowing the complex creatures to stop the loss in time and finally accept it. Oxygen energy enhancement creates the legal effect of kinetic energy, and some organisms that have evolved to accept it will have the opportunity to defeat other organisms that compete with the market.

To give you a simple example, inside your digestive tract, there are still a very large number of primordial germ ecosystems that live in it, helping to digest your food, but they are extremely tired of even a little bit of oxygen, and they are the remnants of a long-established population that was excluded at that time.

When the concentration of oxygen in the air has reached the current level, the form of life has the driving force to develop in a complex direction. And oxygen is undoubtedly that network accelerator.

Summary. Everyone with carbon-based life is nourished by oxygen; But it happens to be the occurrence of life on Earth, which extracts oxygen from chemicals into the Earth's atmosphere. It's like a chicken-and-egg circulatory system.

On other large planets, without the existence of oxygen, the life forms of plant photosynthesis would be gone; And the lack of life, oxygen is also rootless water, only silent in iron ore.

It should be fused with the gas in the atmosphere of the earth's locust ball, and it is mixed, and then the effect of gravity is added, and then it will seep into the air to form air, so there is no air on other planets.

There are many theories about the origin of the universe, one of which is the big ** theory, which means that the universe is formed by the big **. The main components of the air are water molecules and nitrogen and carbon dioxide, these molecules may exist after the big **, but because of their relatively light mass and gravitational attraction they will attach to the massive planet, the air of the earth is formed due to many accidental factors, other planets such as Jupiter its"air"It's just some cosmic dust and debris. In addition, the intense exposure of cosmic rays causes some gas molecules to turn into atoms.

In short, there is no air in the universe, and air is the name given to several combinations of gases. Secondly, due to the light mass of the gas and the presence of gravity, it is impossible for the gas to float in space and can only attach to the surface of the planet.

It is the frequent activity of volcanoes, some N0, S02, methane and a lot of gases, which form biological molecules under high-temperature discharge, and eventually form life, and evolve to organisms that can carry out photosynthesis, and marine algae produce a large amount of O2, so they change the composition of the atmosphere

How the air on Earth came from can be traced back 5 billion years. At that time, the earth had just been born, but with the birth of the earth, a mysterious gas was born, and that was the atmosphere! Suffice it to say, when the Earth was first formed, the atmosphere surrounded it.

At that time, the composition of the atmosphere was completely different from that of now, containing hydrogen and oxygen.

This has to start with the evolution of the earth. But, to make a long story short.

In the early days of the earth's formation, violent crustal movements such as volcanoes and ** continued for a long time. However, because the Earth is located in the "life belt" of the solar system, the substance "water" is formed in the process of these intense geographical activities. The advent of water has brought miracles to life.

The appearance of water caused the appearance of rocks and air on the earth (the atmosphere at that time was only found to contain gases such as nitrogen and carbon dioxide). A more complex substance, proteins, which prepared the conditions for later cell formation.

Three billion years ago, the first cellular organism appeared, when this organism was still only anaerobic organisms, but they had a special function of being able to absorb carbon dioxide and produce oxygen, so in the process of increasing the number of these single-celled organisms, carbon dioxide decreases and oxygen increases. An ancient atmosphere similar to the present day was formed, with a composition of nitrogen and oxygen-based gases.

It is also in this environment that people are born. About 3 million years ago, the first type of true human beings appeared.

In other words, human beings are actually a harmonious biological species that have gradually evolved into a biological species that has adapted to the earth's environment. Therefore, people's physiological signs are also adapted to this living environment.

I can't guarantee that there is no life on other planets that is different from life on our planet, maybe they don't need oxygen but need other gases to survive, but at least, most of the creatures on Earth need oxygen. This is also the result of survival of the fittest. Thank you.

Plants produce the oxygen we need, and we produce the carbon dioxide that plants need. Oxygen and carbon dioxide and other gases make up the Earth's atmosphere!

Proto-atmospheric stage.

About 5 billion years ago, the atmosphere mysteriously "came out" with the birth of the earth. That is, when the nebula began to condense, the earth was already surrounded by a large amount of gas. The main components of the primordial atmosphere were hydrogen and helium.

After the formation of the earth, the decay of radioactive materials in the earth's interior causes the conversion of energy. This conversion had an effect on both the maintenance and extinction of the Earth's atmosphere, which, combined with the strong action of the solar wind and the low gravitational pull of the Earth when it was first formed, caused the primitive atmosphere to disappear quickly.

Secondary atmospheric stage.

After the formation of the earth, due to the drop in temperature, the earth's surface condensed, and the high temperature in the earth's interior prompted volcanoes to frequent activities, and the volatile gases formed during volcanic eruptions gradually replaced the original atmosphere and became the secondary atmosphere. The main components of the secondary atmosphere are carbon dioxide, methane, nitrogen, hydrogen sulfide and ammonia, which are some gases with heavy molecular weights. These gases and the solid matter of the earth are attracted to each other and depend on each other.

The gas was not abandoned by the great centrifugal force of the earth, and became the second life of the atmosphere.

I think the air is made up of carbon dioxide mixed with oxygen and some other gases, because plants need carbon dioxide to breathe and we need oxygen to breathe, we don't need carbon oxide, so carbon dioxide and oxygen are mixed, and the other gases are mixed together to be air.

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.