Why were there no plants on land when the earth was first born?

The mysterious origin of life.

On this beautiful light blue planet where we live, there are more than 100,000 species of microorganisms, more than 300,000 species of plants and more than 1 million species of animals, so people can't help but ask, what did such a rich and diverse variety of creatures originally come from?

Scientists have found that the organisms on our earth today, no matter how big or small, are composed of cells, and the main biomolecules related to life activities in cells are some biomolecules with complex structures. The story begins with the birth of the earth.

It was about 5 billion years ago when a diffuse cloud of slowly rotating gas and dust in the universe formed the primordial solar system. 4.7 billion years ago, some clouds of gas and dust in the primordial solar system condensed to form the first Earth. The newborn Earth was cold and inhospitable, with no complex structure and no life.

Life began to be conceived with the birth of the primordial atmosphere.

In the early solar system, some primitive celestial bodies frequently collided with the young Earth, which increased the size of the Earth on the one hand, and on the other hand, the energy of movement was converted into heat energy and stored in the interior of the Earth. Impacts occur constantly, and a lot of heat energy accumulates in the interior of the earth. The average temperature of the Earth is several thousand degrees Celsius, and the metals and minerals inside have turned into molten hot magma.

Magma moves violently inside the Earth, bursting out of the Earth's surface from time to time to form volcanic eruptions. On the pristine Earth, volcanic eruptions were frequent. With volcanic eruptions, some gases are continuously released from the earth's interior, forming a primordial atmosphere.

However, there were still no biomolecules on Earth at this time.

In the years that followed, as more and more water vapor accumulated in the primordial atmosphere, the Earth's surface temperature began to decrease. When it drops below the boiling point of water, the water vapor drops to the ground as a downpour. The downpour rains fell day and night, forming the first oceans, which prepared the cradle for the birth of life.

At that time, the temperature of the Earth's surface was still very high, and by about 3.6 billion years ago, the temperature of the sea had dropped to about 80, but before that, primitive life had been quietly conceived.

The birth of life is very related to the primordial atmosphere. It is assumed that the main components of the primordial atmosphere were carbon monoxide, carbon dioxide, methane, water vapor, and ammonia. For these simple gas molecules to become biomolecules, they must become complex enough.

Synthesis of complex substances requires energy.

Thankfully, there are various forms of energy available on primordial Earth. First of all, the primitive atmosphere did not have an ozone layer, and the ultraviolet rays from sunlight could enter the atmosphere without any scruples, which brought energy to the earth. Secondly, lightning will appear in the primordial atmosphere, and lightning is a phenomenon of energy release.

Again, volcanic activity was frequent on the primitive earth, and volcanic eruptions could release a lot of heat.

Simple gas molecules, after absorbing energy, become unusually active, which in turn produces chemical reactions to form complex (living) matter. Miller, a scientist in the United States, was the first scientist to successfully synthesize complex (life) matter by simulating the conditions of the primitive Earth's atmosphere.

Quite simply, because the climate at that time was not suitable for plant growth, and plants needed oxygen to grow, there were only a few simple heterotrophs that obtained energy by chemical synthesis of sulfur in the soil.

The temperature of the earth's surface is extremely high, and the magma shoots out in all directions, forming a fireball, and the rocks contain a variety of elements, some of which contain a large amount of water, and due to the high temperature, they are vaporized into space at the moment of impact. It just so happened that at this time, the demonstration of hitting the Earth suddenly decreased, and the rising gas was pulled back by the Earth's gravitational pull and floated in mid-air, and the rocks hitting the Earth were reduced.

The temperature on the ground began to drop, and when it dropped to 300 degrees, the fate of the earth changed! The clouds have also come down, and it's the first time it has rained on Earth! The rain fell to the ground and evaporated, and then more rain was produced, and the ocean was formed, and the formation of the ocean was instantaneous compared to the formation of the ocean when the earth was hit by rocks.

In the first place, there were no animals on Earth, only microorganisms, and there was DNA, in the depths of the oceans. Because there was no oxygen on the earth at that time, most of the gas released by the burning of rocks was carbon dioxide in the air. There are many genes that combine in the sea, some form fish, and some form seaweed plants, which contain chlorophyll.

From time to time, oxygen bubbles will rise in the sea and rise to the surface of the earth, and the oxygen will slowly form here, and the carbon oxide will become a large amount of limestone in the ocean. With oxygen on land, many plants have developed on land. There is more and more oxygen!

Later, animals slowly developed to live on land. That's how we humans slowly evolved.

When the liquid state is separated from the sun, it rotates into its own channel due to the sun or the earth itself, and the liquid state automatically becomes circular during rotation, followed by cooling and orogeny.

When the Earth was first formed, the Sun had already formed 300 million years ago. But at this time, the matter in the primordial nebula of the solar system is not as systematic as it is now, many asteroids and other celestial bodies are floating, and our earth is attacked by meteorite rain every day, and it is like magma everywhere, and it is impossible for life to survive on the earth at this time.

The earth is bare, full of dust and rubble, dusty, there is no oxygen in the air, the sky is cloudy, and the water is not clear.

It also looks bare, like a desert, without green accents, and it looks no vitality at all.

It's a barren place. Because the surface of the earth was full of mud and sand when plants were not yet born, it looked like a barren landscape.

Preface: In fact, the earth was formed 4.6 billion years ago, and at the beginning there were no plants or any living things on the earth, and the surface temperature of the earth was very high at that time, and the environment was completely different from now. 4.6 billion years ago, the earth was scorching in the sky, sometimes lightning and thunder, and the earth's surface would often erupt volcanoes, lava would flow everywhere, and over time, the temperature of the earth's surface would slowly decrease, at this time, some solid dust materials were condensed inside the earth, and gases such as hydrogen and helium appeared outside.

Under the action of the solar wind, the gas slowly detached from the earth, and the atmosphere on the earth's surface slowly disappeared. Under ultraviolet light, water vapor also decomposes into oxygen and hydrogen.

Because hydrogen is very light, it will be very easy to be blown away from the balloon by the solar wind, but oxygen forms oxides on the earth and other substances, so plants and organisms appeared on the earth after oxygen, and at the beginning there was no oxygen in the earth's atmosphere, and there was no ozone layer. Volcanoes erupt during the formation of the second atmosphere, which is why mountains and valleys appear. The water vapor in the positive layer of the atmosphere is saturated and cooled to form rain, which falls on the earth's surface, and water accumulates at the troughs, forming the ocean.

Life appeared after oxygen and water on the earth, at the beginning, some plants slowly formed, because of volcanic eruptions, so the lava cooled down to form land, and the temperature of the earth is slowly decreasing, so new life is very easy to appear, some marine life slowly appeared in the ocean, and some plants appeared on land, and then animals, so it is said that water is the source of life.

Before the plants were born, the earth, like the moon and Mars, was a barren land, with no signs of life, and no other moving and slippery things could survive.

It's a sea ball, and there's a lot of water on the whole earth, with a thick layer of ice, and there may be some flowing water underneath the ice, like a glacier.

The surface of the Earth Slide is a scene submerged by the ocean, and it is also a very bleak scene, except for the land is the sea, there are no mega animals and plants. Clan Kai is old.

The ground of the earth is a very desolate landscape, and if there were no plants, the earth would have no life and would be bare.

Among the nine planets of the solar system, the light blue earth is the only planet full of life, and nearly two million species of life are active in its mountains, oceans, forests, blue skies, and poles, and it is a well-deserved paradise of life. But why does life love the earth so much? Although the academic community is not yet able to give an accurate definition of life, life is a complex phenomenon that has two basic characteristics:

One is the ability to replicate itself; The second is to be able to metabolize. The conduct of these two activities requires energy, and as far as animals and plants are concerned, the ultimate source of energy is too dry and sunny. If the planet is too far away from the sun, such as Pluto, it receives very little sunlight, like the legendary underworld, where life cannot survive because it does not have enough energy; If the planet is too close to the sun, such as Venus, it receives a lot of solar light, and the temperature is above 400 degrees Celsius day and night, just like the mythical purgatory, and life is difficult to survive.

The earth is neither too close nor too far from the sun, and the light received is moderate, and plants can freely use the sun's light energy to photosynthesize and store the energy needed for life activities, when vegetarian animals eat plants, this stored energy goes to the body of vegetarian animals, and when carnivores eat vegetarian animals, the energy goes to the body of carnivores......In this way, it is the light energy of the sun that activates the life machinery of animals and plants on the earth, so that the descendants of animals and plants can flourish and live endlessly. The right temperature on earth is necessary for life activities. The energy required for life activities is supplied through metabolism, and a supercold or overheated environment is not conducive to the normal progress of metabolism, and only at the right temperature can plants effectively carry out photosynthesis.

The earth is protected by an atmosphere, which is by no means optional for the life that inhabits it, because: the atmosphere blocks the strong ultraviolet rays from the universe, so that life on the earth is not harmed; The atmosphere blocks most of the meteorites that crash into the Earth, so that the surface of the Earth is not as cratered as the surface of the Moon; The atmosphere is like a thick quilt, so that the sunlight that hits the earth's surface will not be emitted into space, so that the temperature on the earth will not change drastically; If there is no protection of the atmosphere, there will be no wind and rain on the earth, and there will be no rivers, lakes and seas, and the earth will be a dead and desolate planet. There is thriving life on Earth, which is not separate from being a rocky planet.

The core of the earth is molten magma, and the main component of magma is iron. During the rotation of the Earth, a strong magnetic field is generated in the ferrous core. This magnetic field envelops and protects the Earth.

When a solar storm, a stream of high-velocity charged particles from the sun, hits the Earth violently, the magnetic field that surrounds the Earth keeps it out of space, protecting life on Earth. The conditions on Earth are unique for life. However, in the vast universe, the solar system is just a part of the ocean, the sun is not the only star in the vast space, is the earth the only planet inhabited by life in the vast sea of stars?

The plants on the earth are terrestrial plants as well as marine plants. The first plants to appear on Earth were algae that grew in the sea, about 3.2 billion years ago. The earliest terrestrial plants appeared in 3...

500 million years ago: At that time, due to the warm, humid climate on Earth, sheep tooth plants began to appear on land. This type of plant grows at first low on the ground, about 20 centimeters tall, its stems are very straight, and more interestingly, it has no roots, therefore, it can only grow in damp places.

Later, sheep's tooth plants gradually developed into dry places. In order to survive, it grows roots and is becoming more and more developed. With roots that absorb nutrients and water from the soil, these plants grow taller and taller, and as a result, tall forests of sheep's teeth cover the earth.

Later, due to the great changes in the climate, the sheep's tooth plants slowly disappeared, and the pine and cedar plants gradually grew, gradually growing into the flowers and trees we see today.

The tallest plant in the world is the evergreen American cedar in California, USA, which stands at more than 110 meters tall.

The heaviest tree in the world is the giant sequoia. Currently, the record holder is the famous "General Sherman" with an estimated weight of 2500 tons.