The history of the formation of the earth s crust and how the earth s crust was formed

The Earth's crust is the outermost solid crust of the Earth and is made up of different types of rocks and minerals. It is mainly composed of a combination of silicon, aluminum, oxygen, iron, magnesium and other elements.

1. The thickness and composition of the earth's crust

The thickness of the earth's crust varies from region to region, but is generally about 5-70 km. The earth's crust is made up of two main types of rocks: massive crust (continental crust) and homogeneous crust (oceanic crust).

2. The composition of the continental crust

The main code bonds of the continental crust are composed of siliceous aluminous rocks, including granite, gneiss, sandstone, and shale. These rocks are rich in silicon and aluminum, while also being low in elements such as magnesium and iron.

3. The composition of the oceanic crust

The oceanic crust is mainly composed of basalt, a type of rock rich in magnesium and iron. Compared to the continental crust, the marine crust contains a lower content of silicon-aluminium and is rich in calcium and magnesium.

4. Other elements and minerals in the earth's crust

In addition to the main constituent elements mentioned above, the earth's crust also contains other important elements and minerals. For example, elements such as iron, magnesium, aluminum, sodium, potassium, etc., are widely found in the earth's crust and form various minerals such as quartz, feldspar, mica, magnetite, etc.

5. Changes and structure of the earth's crust

The earth's crust is a component of the Earth's tectonic plates, which change through tectonic movements and geological processes. The structure of the crust can be divided into graben, crustal uplift, horizontal movement of the crust, etc., and these changes lead to the formation and change of the crust.

6. The importance of the earth's crust

The earth's crust is the basis of human activities, including construction, mining, agriculture, etc. The earth's crust is also an important object of geological research, and by studying the composition and changes of the earth's crust, we can understand the evolution history and geological processes of the earth.

7. The relationship between the earth's crust and other layers of the earth

The Earth's crust is located in the upper layers of the Earth, with the mantle, outer core, and inner core below. There is an interaction between the Earth's crust and mantle called the lithosphere-asthenosphere interaction. This interaction affects phenomena such as Earth's **, volcanic activity, and plate movements.

Summary:

The Earth's crust is the outermost solid crust of the Earth and is made up of different types of rocks and minerals. The continental crust is mainly composed of siliceous aluminous rocks, while the oceanic crust is mainly composed of basalt. The composition and changes of the earth's crust are of great significance for earth science and human activities.

The Earth's crust is a solid crust made up of rocks, the outermost layer of the Earth's solid sphere, an important part of the lithosphere. The earth's crust is divided into two layers, the upper layer has an average chemical composition similar to that of granite, also known as granite layer or silicon-aluminum layer, and the main components are oxygen, silicon, aluminum and other elements. The lower layer is known as the basalt layer or the silicon-magnesium layer and is rich in silicon and magnesium.

The earth's crust contains 92 elements, of which oxygen accounts for more, silicon accounts for the second, in addition to these two elements, rotten stupid also contains magnesium, potassium, sodium, calcium, iron, aluminum and other elements. Aluminum belongs to the category of metals, which is about one-third of the total type of crustal metals.

Crusts are divided into continental crust and oceanic crust based on thickness and composition. The average thickness is 16 kilometers, and the volume is divided into the upper crust (silicon-aluminum layer) and the lower crust (silicon-magnesium layer) according to the composition of the earth's pre-sodium volume, and the silicon-aluminum layer is also called the granitic layer, and the main group of Hui file elements are O, Si, AI, etc., which are only distributed on the continental crust. The silicon-magnesium layer, also known as the basalt layer, is composed of mainly O, SI, MG, Fe, etc., and is found in both continental crust and oceanic crust.

The earth's crust is divided into two layers, upper and lower. The chemical composition of the upper layer is mainly oxygen, silicon, and aluminum, and the average chemical composition is similar to that of granite, which is called granite layer, and some people also call it "silicon-aluminum layer".This layer is thin at the bottom of the ocean, especially in the ocean basin floor, and even absent in the central Pacific Ocean, and is an uncontinuous circle.

The lower layer is rich in silicon and magnesium, and the average chemical composition is similar to that of basalt, which is called the basalt layer, so some people call it the "silicon-magnesium layer" (another way of saying that the entire crust is a silicon-aluminum layer, because the aluminum content of the lower layer of the earth's crust still exceeds that of magnesium; The rock part in the upper part of the mantle has a very high magnesium content, so it is called a silicon-magnesium layer); It is distributed in both continents and oceans, and is a continuous circle. The two floors are separated by a Conrad discontinuity.

The primordial earth is a homogeneous solid, which has just cooled down from its red-hot state. However, "the trees want to be quiet and the wind does not stop", and the cooling earth is facing a moment of melting. The heat that causes the Earth to melt again comes mainly from microstars falling from the sky.

The gravitational pull of huge planets is often very strong, attracting tiny stars roaming in the solar system, and the story of big fish eating small fish is staged. Dust and debris are attracted by the earth and hit the surface of the earth, and the kinetic energy is converted into heat energy, which causes the surface temperature of the earth to rise. At the same time, due to the overall contraction of the earth, the density of the earth's interior is increasing, and the pressure is also increasing, resulting in an increase in the temperature of the earth's interior.

And some radioactive elements contained in the earth itself, such as uranium, emit heat when decaying, accumulate for a long time, and the energy is also considerable.

Three streams of heat surged through the Earth's body, melting the newly solidified Earth again, reaching a temperature of 1000 or more. At 400 to 800 kilometers underground, the temperature even exceeds the melting point of iron. Metals such as iron and nickel in solid rocks are the first to melt, and due to the high density of these elements, under the action of gravity, iron and nickel form molten droplets, which sink to the center of the earth, and finally form a core of iron and nickel in the center of the earth. Lighter rocky materials, such as silicon, aluminum, magnesium, etc., float up to the surface and cool to form the earth's crust.

The material between the earth's crust and core forms the mantle.

The loss of heat has once again frozen the earth, at least on the surface, under a world of solid rock. Is the earth getting hotter or colder? We know that the greenhouse effect warms the planet due to the increase in carbon dioxide in the atmosphere.

However, when people talk about global warming, they mainly refer to the earth's atmosphere. For the earth as a whole, especially the solid spheres, although there are no more microstars in the sky and the earth no longer shrinks, the decay of radioactive elements is long-term, from the day of the earth's birth to today. It has been calculated that the current loss of geothermal energy from the Earth's interior will reduce the Earth's temperature by 100 percent in 1 billion years; The accumulation of thermal energy generated by the decay of radioactive elements can raise the Earth's temperature by 200 percent in 1 billion years.

Simply doing the offset calculation, the temperature in the Earth's interior should be increasing. The ancients had "people worried about the sky", afraid that the sky would fall; Today, we don't have to worry about the earth melting. Because the temperature rises extremely slowly, every 1 rise takes tens of millions of years.

Moreover, the thermal conductivity of the earth's rocks is very poor, and it takes a long time for the heat to reach the surface. For now, it's more realistic to deal with the greenhouse effect first.

The earth was born without a crust, because it was much closer to the sun than it is now, the whole earth was irradiated by the sun's high heat rays and was in a molten state, and later due to the centrifugal force generated by the revolution around the sun, the earth gradually cooled down and began to solidify, plus various alien objects landed on the surface of the earth and gradually evolved into the current crust.

It is precisely because the earth's crust is formed in this way that it can be understood that the earth's crust is floating on the mantle, and there are various crustal movements now.