Why is it that the earth 2 3 and above is full of oceans and very little land?

First of all, our earth has a very rich water resource, in addition to the water in the soil and rock surface, there are also huge water resources underground, so much water resources will naturally cover most of the landmass, forming more than two-thirds of the ocean.

A long time ago, there was a lot of land and very little seawater, but because of the biological process, more and more water was produced, so the sea water began to exist.

Because the earliest life on the earth appeared from the ocean, it is the way it is today.

71% ocean, 29% land, and the Earth is generally blue when seen from space. The main components of the atmosphere are nitrogen and oxygen, as well as small amounts of carbon dioxide and argon.

The total surface area of the Earth is about 100 million square kilometers, about the surface area is covered by water, and most of the surface of the Earth's crust (100 million square kilometers) is below sea level. The crustal surface of the seafloor is mountainous, including a global system of mid-ocean ridges, as well as submarine volcanoes, trenches, submarine canyons, submarine plateaus, and abyssal plains.

Hydrosphere resources. In the solar system, the surface is covered by a large area of water, which is one of the distinguishing features that distinguishes the Earth from other planets, from which the Earth's nickname "Blue Planet" is derived.

The Earth's hydrosphere is mainly made up of oceans, but also land, sea, lakes, rivers and groundwater that can be as deep as 2,000 meters. The Challenger Deep, located in the Mariana Trench in the Pacific Ocean, is the deepest part of the ocean.

The total mass of the Earth's oceans is about tons, which is equivalent to 1 4400 of the total mass of the Earth. The ocean covers an area of square kilometers, with an average depth of 3,682 meters and a total volume of about cubic kilometers.

If all the Earth's surfaces were at the same altitude and were a smooth spherical surface, the average depth of the Earth's oceans would be kilometers.

The amount of water on the earth was brought by the impact of a comet carrying water hundreds of millions of years ago, due to the right temperature, coupled with the influence of sunlight, dimension, altitude, etc., the water on the earth can exist in gaseous, solid and liquid states, and the proportion of the three is affected by the change of the earth's environmental temperature. The land area has not changed since ancient times, continental plate movements, volcanic eruptions, etc. are all factors in the formation of continents, and now many mountain ranges are well above sea level can also be found in fish and other marine life fossils, proving that they were once at the bottom of the sea.

With the formation of various land-making movements, after the formation of various continents, the difference in the density of the atmosphere above the earth and over the ocean causes air flow, and the ocean water can form a large amount of water vapor, which can be cooled and lowered over the land with the movement of the atmosphere, plus the factors of dimension and height, the distribution of water on the earth is not very uniform, and now the world is warming, and some ancient ice sheets have melted, resulting in the rise of sea level, and the rise of sea level means that the area of the ocean will change to a certain extent. In the future, this may also make the land area too small, weaken the heating effect of ground radiation on the atmosphere, and cool the earth.

There are many opinions about the earth's water, and there was no water in the beginning. But a long time ago, when the whole earth was covered by water, life began to appear, and the first complex organic matter, to the simple life, was produced in water, and there was no land for a long time. Well, it doesn't matter how the water came from, but the truth is later.

Everything happens for a reason, and the current ocean area on the earth can account for seven-tenths of the earth's area, because the earth has enough water, and geological activity has just formed such a result, which seems to be nonsense, but it really needs to be explained in this way.

The amount of water on Earth was hundreds of millions of years ago because of comets that carried water.

Impact, due to the right temperature, plus the influence of sunlight, dimension, altitude, etc., the water on the earth can exist in gaseous, solid and liquid states, and the proportion of the three is affected by the temperature change of the earth's environment, ice age.

The area of solid water is larger, and there is less water vapor in the atmosphere, and the area of the ocean is likely to shrink. And the land area has not changed since ancient times, with continental plate movements and volcanic eruptions.

These are all factors in the formation of continents, and many mountains now have fish and other marine life that can be found well above sea level.

Fossils, proving that they were once at the bottom of the sea.

With the formation of various land-making movements, after the formation of various continents, the difference in atmospheric density over the atmosphere above the earth and over the ocean causes air flow, ocean water can form a large amount of water vapor, and can cool down and fall over the land with the movement of the atmosphere, plus the factors of dimension and height, the distribution of water on the earth is not very uniform, and now the world is warming, and some ancient ice sheets are melting, resulting in the rise of sea level, sea level rise.

This means that there will be some changes in the area of the oceans, and in the future, this may also make the land area too small, and the heating effect of ground radiation on the atmosphere will be weakened, which will cool the earth.

The earth's water and continents are still in motion, the ocean and land area are not constant, but the total reserves of the earth's water are very large, and the amount of fresh water may affect human survival due to the distribution problem, but the earth is not short of water, but human beings lack efficient methods to convert seawater into drinkable fresh water, so that some places lack fresh water. But the development of science is endless, there are still many things in our lives that cannot be explained by science for the time being, let alone the vast ocean, but one thing that can be said is that we human beings have been progressing, science and technology are constantly developing, I believe that in the future, we can better understand the depths of the sea.

Because it is said that a long time ago, the whole earth was a vast ocean, and then the tide receded, and the land gradually appeared, which also created a situation where there were more oceans and less land.

I don't think there's a reason for this kind of thing, it's just that. Some of the earth's tectonic plates are moving, some of the ground is not fully uplifted, and some of the land is covered by the ocean.

It is mainly due to the movement of the earth's plates, the uneven terrain, and the collection of a large amount of water, and it is said that in the past, the earth was due to condensation caused the earth's crust to shrink, so that the oceans have the basic conditions for convergence.

This is the result of geological activity, climate change, and with global warming, the proportion will be even more uneven.

Because water is also a non-renewable resource, once people use it, it will disappear, and there are many humans on the earth, so it must be a larger proportion of land area.