Earth's crust

The Earth consists of 2 large layers: Outer and inner layers. The outer layer consists of the atmosphere, hydrosphere and biosphere. The inner layer consists of soil, mantle and soil core.

The bark is the outermost layer consisting of weathered soil and rock. Soil crust layer also called lava. The soil cover only accounts for 0.5% of the Earth's volume. If the mantle layer and the core layer like the white and yolk of the egg, then the soil is like an eggshell.

(Photo: astro.lsa)

The thickness of the earth's crust in each other is very thick, the thickness of the Qing Tibetan Plateau - China can reach 60-80km; there is a very thin place like the Atlantic ocean valley, which is only 5-6 km thick, Pacific ocean valley about 8km. The thickness of the soil cover on the continent is about 33km on average, accounting for 1/200 Earth radius.

The soil cover is very thin, but the structure of the upper and lower layers is very different. The upper part consists mainly of lava with very small density, light density. The main components are silicon, aluminum, so this part is called silicon - aluminum . The lower part is mainly composed of magical lava with high density and density. The main component is magnesium, iron, silicon, so-called silicon-magnesium . On the sea floor, because the soil is very thin, there is usually only the aluminum silic layer, not the magnesium silice. In addition, the top layer also has an outer shell consisting of sediment, sediment and weathered soil.

Earth's crust is not immobile, forever unchanged.In the long history of the Earth, many great changes have occurred: Continent drift, large array of moving, volcanic eruptions, earthquakes . are all manifestations of the Earth moving . The bark is also influenced and invaded by the atmosphere, hydrosphere and biosphere, forming surface types with different characteristics. In which, the relationship between people and land is very close together.

In the soil, the soil is extremely rich in mineral resources. Now more than 2,000 types of ores have been found, in which things like gold, silver, copper, iron, tin, tungsten, manganese, lead, zinc, mercury, coal and oil . are things integral to material civilization of mankind.

The inner structure of the Earth, the Earth's crust ( Earth crust ) is the outer layer (Photo: iga.igg)