GEOLOGY

Detailed explanation-1: -The inner core’s intense pressure-the entire rest of the planet and its atmosphere-prevents the iron from melting. The pressure and density are simply too great for the iron atoms to move into a liquid state.

Detailed explanation-2: -The inner core of the Earth has temperatures and pressures so great that the metals are squeezed together and are not able to move about like a liquid, but are forced to vibrate in place as a solid. The inner core begins about 4000 miles beneath the crust and is about 800 miles thick.

Detailed explanation-3: -Compared to the inner core, the outer core of the Earth is under low pressure. The pressure of the outer core is between 135-330 GPa or 1.3-3.3 million atmospheres while the inner core is about 360 GPa or 3.6 million atmospheres.

Detailed explanation-4: -The pressure in the Earth’s inner core is slightly higher than it is at the boundary between the outer and inner cores: It ranges from about 330 to 360 gigapascals (3, 300, 000 to 3, 600, 000 atm).

Detailed explanation-5: -The inner core is solid due to the pressure caused by the weight put on it by the Earth’s other top layers. It is distinct from the outer core, which is a liquid.