The area of the Earth comprised mainly of extremely hot liquid metals is the Earth's outer core.

Here's why:

* Composition: The outer core is primarily made up of iron (Fe) and nickel (Ni), along with smaller amounts of other elements like sulfur (S) and silicon (Si).

* Temperature: The outer core is incredibly hot, with temperatures estimated to be between 4,500°C and 5,500°C (8,132°F and 9,932°F).

* State: Due to the intense heat and pressure, the metals in the outer core are in a liquid state.

This liquid metal is constantly moving, generating electric currents that create Earth's magnetic field.