How is the Earth s land mass formed? How much land did the Earth have before?

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.

Of course, there is also an unscientific statement, as if Pangu's body turned into land!

Volcanic eruptions form primordial continents, called pancontinents. Then, due to the rotation of the earth, it drifted and became what it is now.

The existence of the earth's land is determined by the amount of water on the earth's surface!

If there is no water on the surface of the earth, then the whole earth is land.

If the earth's surface is all water, then there is no land on the whole earth.

It is the quality of the earth's water that determines the amount of the earth's land area.

Don't believe what is in the books! Don't believe it all!

The German philosopher Immanuel Kant proposed the "nebula theory" in 1755. Based on the astronomical observations of the time, he believed that there were primitive scattered particles of matter in the universe, which produced a rotational motion around the center and gradually concentrated in a plane, and finally the central matter formed the sun, and the matter on the equatorial plane formed planets such as the earth and other small celestial bodies. This "nebula theory" later gradually formed a school of thought on the origin of the solar system.

The formation of the earth, according to the nebula theory, the earth's protostars were about 500 times heavier than now, and the diameter was about 2,000 times that of the present. When the sun shrinks to the interior to react, the sun heats up, emits light, and radiates a large number of particles, which sweep to the earth's surface and "drive away" the light matter on the earth's surface. So the earth is left with those dense, basically solid matter.

There are also some hypotheses, and there is some truth to them. For example, some people think that the earth is thrown out of the sun; Some believe that one of the twin stars of the Sun became the Earth after it became fragments. These hypotheses are not accepted by everyone like the nebula theory.

Human scientists have been able to reconstruct information about the Earth's past. The material of the solar system originated 100 million 600,000 years ago. About 100 million years ago (about 1% error), the Earth and other planets in the solar system began to form in the form of a disk of gas and dust left over from the formation of the solar nebula.

Through the process of accretion, the Earth has been roughly fully formed over a period of 1 to 20 million years.

From its initial molten state, the Earth's outer layers first cooled and solidified into a solid crust, and water began to accumulate in the atmosphere. The moon formed relatively late, about 100 million years ago, when a Mars-sized object with a mass of about one-tenth of the Earth's mass (commonly known as Theia) collided fatally with Earth. Part of the mass of this celestial body is combined with the Earth, and part of it is splashed into space, and enough material enters orbit to form the Moon.

The release of gases and volcanic activity produces a primordial atmosphere, and water carried by asteroids, larger protoplanets, comets, and extra-Neptune bodies increases the amount of water on Earth, and condensed water produces oceans. The newly formed sunlight is only 70% of the current sun's luminosity, but there is evidence that the early oceans were still liquid, which is known as the weak young sun fallacy. The combination of the greenhouse effect and higher solar activity raises the temperature of the Earth's surface and prevents the condensation of the oceans.

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.

When we live on the earth, we see endless mountains, endless plains, endless deserts and Gobi deserts, and vast seas ......If you get on an airplane and look down from the sky, you will feel that the land is really vast. How big is the Earth? Scientists have calculated that it has a surface area of about 100 million square kilometers, a volume of about 1,080 billion cubic kilometers and a weight of about 60 trillion tons.

If you go all the way south from its northernmost North Pole, it would be 20,000 kilometers to reach its southernmost South Pole. For such a long distance, if you walk 50 kilometers per day, you have to walk continuously for 400 days; If you take a jet that can fly 800 kilometers per hour, it will take you 25 hours to arrive. And that's only half a circle of the Earth.

If we follow its largest parallel, the equator, to the east or west, to fly a full circle, and then return to the original starting point, it will take more than 50 hours, and we will have to fly for more than two days in a row. It took nearly three years for the navigator Magellan to lead a fleet around the globe. The size of the earth can be imagined.

If we compare the area, the entire earth's area is equivalent to 53 times the area of China's territory and 2,000 times the area of the British mainland. But only 29% of the Earth's surface is land, and 71% is ocean. The size of the Earth can be described by a number of indicators.

Now I will tell you the number of some indicators. The average radius of the Earth is kilometers; The Earth's equatorial radius is kilometers; The Earth's polar radius is kilometers; The average density of the Earth is to the power of kilograms cubic meters; The mass of the Earth is to the power of ) kilograms; The volume of the Earth is to the power of cubic kilometers; The surface area of the Earth is to the power of square kilometers. The total area of the earth is 510000000 square kilometers The land area of the earth is 149000000 square kilometers, accounting for 361000000 square kilometers of the earth's surface area, and the volume of the earth is cubic meters.

To illustrate by example, suppose a person travels 50 kilometers a day, and it takes 127 days to walk from the center of the earth to the surface and 801 days to go around the earth. More than 23 million people stand in a circle hand in hand to enclose the earth. Based on the world's population of 5 billion, the per capita land surface area is only square kilometers, and if only the land area is calculated, the per capita occupancy is less than square kilometers.

Compared to the other planets of the solar system, the Earth is 110 times larger than the smallest Pluto, and 1,1316 times larger than the largest Jupiter. The Earth is 48 times larger than the Moon and 11.3 million times the size of the Sun.

The total area is 510000000 square kilometers The earth's land area is 149000000 square kilometers, accounting for 361000000 square kilometers of the earth's surface area.

Yes, later due to the movement of the earth's crust, the continents drifted together, and the connected landmasses were divided into continents, and Wegener was the one who discovered the continental drift. The current volcanoes are caused by crustal movements, that is, continental drift. Since the continental movement has gradually stabilized, the current continental movement is relatively slow and difficult to detect in the lifetime of human beings.

But there are scientists**: in the next few million years, the Red Sea will become a new ocean due to continental drift.

Yes, it used to be a whole continent, but later due to the movement of tectonic plates, it became what the Earth is now.

Geographically speaking, the earth's crust is constantly moving, and it should have been one piece at first, and then it was separated due to volcanic activity and drifted to the four seas, even the current ** is also because of the movement of the earth's crust.

It was last called "Pangea" ("Pangea" or "Pan-Continent") hundreds of millions of years ago

According to Wegener's continental drift hypothesis, this is true

It was just formed that the Earth did not even have a solid shell.

There wasn't even a single life at that time.