Which part of the Earth is a dense sphere of solid iron and nickel located at the center?

The inner core of the Earth is described as a dense sphere primarily composed of solid iron and nickel, situated at the planet's center. This region experiences extremely high temperatures, which are believed to be comparable to the surface of the sun, and immense pressure, resulting in the iron and nickel being in a solid state despite the intense heat.

The inner core's solid composition differs significantly from the outer core, which is liquid, made up of molten iron and nickel. Also, the mesosphere and asthenosphere refer to different layers of the Earth; the mesosphere is the lower part of the mantle, while the asthenosphere is a semi-fluid layer of the upper mantle that allows tectonic plates to move. Understanding the composition and state of these layers is crucial for comprehending geological and geophysical processes occurring within Earth.