1. Outer Core: This layer is a liquid, primarily composed of iron and nickel, with traces of other elements. It's extremely hot (around 4500°C) and is constantly moving, creating electric currents that generate Earth's magnetic field.

2. Inner Core: This layer is a solid ball of iron and nickel, despite being even hotter (around 5200°C) than the outer core. The immense pressure at the Earth's center, about 3.5 million times the pressure at sea level, is the reason for its solid state.