The outer core, one of the three layers of the Earth, is approximately 1,430 miles (2,300 kilometers) thick and between 7,200 and 9,000 F. According to National Geographic, the outer core is mostly composed of iron and nickel in a liquid alloy form
The outer core is made up of two layers, the outer core, and the inner core. The outer core is the third layer of earth. It is a liquid layer and is mainly made up of metals (iron and nickel). The outer core holds Earth's magnetic field.
