Here's why:

* Composition: The outer core is primarily composed of liquid iron (around 88%) and nickel (around 5.5%). It also contains small amounts of other elements like sulfur, silicon, and oxygen.

* State: The outer core is a liquid layer due to the intense heat and pressure.

* Magnetic Field: The movement of the liquid iron within the outer core generates Earth's magnetic field.

Let me know if you have more questions about the Earth's layers!