What is the innermost layer of the Earth called?

The innermost layer of the Earth is called the Inner Core. This layer is primarily composed of solid iron and nickel, and it exists under extreme pressure and high temperatures, which keeps it in a solid state despite the intense heat. The Inner Core is surrounded by the Outer Core, which is in a liquid state due to lower pressures, allowing the iron and nickel to remain molten.

Understanding the structure of the Earth is essential in geology, as each layer plays a significant role in the planet's geology and magnetic field. The other layers, such as the Outer Core, Crust, and Upper Mantle, are important as well but are located above the Inner Core. The distinction between these layers helps explain various geological phenomena, including tectonic activity and the generation of the Earth's magnetic field, which originates from the movements in the liquid Outer Core surrounding the solid Inner Core.