Whether man lives inside or on the surface of the earth, whether man lives on the surface of the ear

The internal structure of the Earth.

The interior of the earth has a layered structure of concentric spherical layers, and the material composition and physical properties of each layer change. The interior of the earth cannot be directly observed, so most knowledge about the interior of the earth is obtained indirectly. For example, the average density of the Earth can be calculated to be gram centimeters3, based on astronomical knowledge of the Earth's mass and geodetic shape and size.

However, the density of surface material is less than g cm3 ; Therefore, it can be inferred that the density of the material in the Earth's interior is greater than that of gram cm3. According to the fact that meteorites are divided into stony meteorites and iron meteorites, and because the earth has an obvious endogenous magnetic field, it can be inferred that there is an iron core inside the earth. Mainly according to the various signs shown by the propagation of ** waves in the earth's interior, it is proved that the earth's interior can be roughly divided into 3 components: the crust, the mantle and the core.

Earth's crust The outermost layer of the Earth's spherical structure. The thickness of the continental crust is generally 35 45 km, and the thickness of the Himalayan crust can reach 70 80 km. 1909 a

Moholovich confirmed the existence of the subcrustal interface based on the travel time of the near-seismic wave, and the velocity of the longitudinal wave below this interface suddenly increased from an average of kilometers to kilometers. This sub-interface was later called the Moho interface. The continental crust is generally divided into the upper crust and the lower crust, the upper crust is harder, which is the main stress and prone to the occurrence of the layer, and the lower crust is softer.

The oceanic crust is thinner, generally with only one layer, and is more uniform than the continental crust.

Mantle The middle layer between the earth's crust and core. The average thickness is more than 2,800 kilometers. 1914, B

Gutenberg measured the depth of the interface between the Earth's core and the mantle at 2,900 km, which is quite accurate and is only 15 km short of the newly calculated value. The Earth's mantle is further divided into the upper mantle (above 350 km depth) and the lower mantle. There is a low-velocity layer of ** waves in the upper mantle, and the low-velocity layer is above the relatively hard top of the upper mantle.

The top of the upper mantle and the earth's crust are often referred to as the lithosphere. The global lithospheric plates make up the outermost structure of the earth, and the tectonic movement of the earth's surface is mainly carried out within the lithosphere.

The study of crustal equilibrium suggests that there is a layer of material beneath the lithosphere, which is less strong and allows for slow deformation and horizontal flow. 1914, JBalrell calls this layer of matter the asthenosphere.

The asthenosphere concept and the concept of the low-velocity layer of the mantle in science seem to refer to the same object, and many people equate them. The theory of plate tectonics holds that lithospheric plates float above the asthenosphere and can move horizontally on a large scale.

The core of the Earth, mainly composed of iron and nickel, has a radius of 3,480 kilometers. 1936 , iAccording to the longitudinal wave passing through the earth's core, Lyman proposed that there is a sub-interface in the earth's core, and the earth's core is divided into two parts: the outer core and the inner core.

Since the outer nucleus cannot allow transverse waves to pass through, it is inferred that the state of matter of the outer nucleus is liquid.

On the surface, of course, but inside is hot lava.

Isn't the interior of the earth a no-man's land.

Man is living on the surface of the earth.

The Earth's surface system is a component of the Earth's inner sphere, which is mainly composed of the lithosphere, atmosphere, hydrosphere, anthroposphere and biosphere.

The geosphere is divided into two parts: the outer and inner spheres of the earth. The Earth's outer sphere can be further divided into four fundamental layers, namely the atmosphere, hydrosphere, biosphere, and lithosphere; The inner sphere of the Earth can be further divided into three basic spheres, namely the mantle sphere, the outer nuclear liquid sphere and the solid inner core. In addition, there is an asthenosphere between the outer circle of the earth and the inner circle of the earth, which is a transition layer between the outer circle of the earth and the inner circle of the earth, located at an average depth of about 150 kilometers below the ground.

The atmosphere, hydrosphere and biosphere in the Earth's outer sphere, as well as the surface of the lithosphere, are generally studied by direct observation and measurement. At present, geophysical methods are mainly used to study the inner circle of the earth's squirting and tambo, such as the inversion of high-precision modern space geodetic technology observations.

Humans live on the surface of the earth. The internal structure of the earth is divided into the crust, mantle, and core, and humans live on the earth's crust. The reason why humans do not break away from the ground is because of gravity, the mass of the earth itself is very large, and it will exert a gravitational pull on any object around the earth; Newton's law of gravitation states that there is a gravitational force between any two substances that have mass, and humans are attracted by a huge gravitational attraction so they do not fly.

Humans live on the surface of the earth. The internal structure of the earth is divided into the crust, mantle, and core, and humans live on the earth's crust. The reason why human beings will not get away from the ground is because of gravity, the mass of the earth itself is very large, and it will have a gravitational pull on any trace of the earth around the earth; Newton's law of gravitation states that there is a gravitational force between any two substances that have mass, and humans are attracted by the huge gravitational attraction of Ziyan, so they can't fly.