Barysphere

Barisfera (Greek βαρυς - heavy, σφαιρα - ball) - the inner part of the Earth, including the core and the intermediate shell, or mantle . The central region of the planet from a depth of 2,900 km from the surface. Sometimes under the barisphere understand only the core of the Earth.

The internal structure of the barisphere is established according to the study of the speed of passage of seismic waves, indicating a different density of matter; the latter grows to the center from 5.5 g / cm³ to 12 g / cm³. According to the state of the substance, the barisphere is a mass of conditionally iron-nickel composition under high pressure. The temperature in the barisphere reaches 2000-5000 ° C, pressure - 3.5 million atmospheres.

Historically, there were 3 hypotheses regarding the state of the barisphere:

• The hypothesis of the gaseous state of a nucleus is based on an increase in temperature as it deepens, and therefore, in the center of the globe, temperatures must be very high and the substances of the nucleus go into a gaseous state.
• The hypothesis of the liquid state of the nucleus emerges from physical laws, according to which, at a huge pressure inside the Earth, a substance must be in a liquid state.
• The solid state hypothesis. Its advantage is evidenced by the large specific gravity of the central parts of the Earth and the high pressure at which the substance must remain in a solid state.

Modern geophysics proceeds from the theory of the two-layer structure of the Earth’s core, where the outer shell is in the liquid state and the inner shell is in the solid.