LAYERS OF THE EARTH ACCORDING TO PHYSICAL PROPERTIES

OUTER AND INNER CORE

Within the core an inner region exists where pressures are so great that iron is solid despite its high temperature. The solid center of the Earth is in the inner core. Surrounding the inner core is a zone where temperature and pressure are so balanced that the iron is molten and exists as a liquid. This is the outer core. The difference between the inner and outer cores is not one of the composition. Instead, the difference lies in the physical states of the two: one is a solid and the other is a liquid.