The interior temperature, pressure, and density of the Earth

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In deep wells and mines, a temperature increase is noted with increasing depth.
These facts corroborate the theory that the temperature rises toward the earth's center, as does the eruption of molten lava from the planet's interior.
The many data demonstrate that the pace of temperature rise is not constant from the surface to the center of the earth. In certain locations, it moves more quickly than in others.
The initial rate of temperature increase is 10C on average for every 32 meters of depth increase.
The pace of temperature increase is 120C per km in the upper 100 km and 200C per km in the next 300 km. However, when one descends farther, this pace drops to just 100C per kilometer.
As a result, it is expected that the rate of temperature increase below the surface is decreasing toward the center (do not mistake rate of temperature increase with temperature increase). As one moves from the surface of the earth toward its center, the temperature always rises.
It is thought that the temperature in the center is between 30,000 and 50,000 degrees Celsius, but it might be considerably greater because of the chemical reactions that occur there under extreme pressure.
Because of the intense pressure from the materials above, the materials in the center of the planet remain solid even at such high temperatures.

Similar to temperature, pressure rises as one moves from the earth's surface toward its center.
The immense weight of the things that are on top of it, such rocks, is the cause.
According to estimates, the pressure in the deeper regions is extremely high, roughly three to four million times higher than the atmospheric pressure at sea level.
High temperatures cause the materials below to melt toward the earth's center, yet because of intense pressure, the molten materials take on the characteristics of a solid and are most likely in a plastic condition.

The density of the earth's layers continues to rise nearer the center due to an increase in pressure and the presence of heavier minerals like iron and nickel.
From the crust to the core, the average layer density increases, reaching a high of over 14.5 g/cm3 in the center.