About 2,890 km (1,800 mi) below the earths surface at its outer boundary.it is about 2,260 km thick.
The crust.
It is a liquid layer composed primarily of molten iron and nickel.
The answer is hot liquid
The earth's outer core is a 2,250 km thick layer of the Earth which is composed of liquid iron and nickel which lies between the Earth's mantle and solid inner core. Flow / movement within the liquid...