Earth's innermost layer is called the core. The outside of Earth's core is made from molten nickel and iron that can reach temperatures of 9,000 degrees Fahrenheit (5,000 degrees Celsius).

"Traditionally we've been taught the Earth has four main layers: the crust, the mantle, the outer core and the inner co. Scientists Detected Signs of a Hidden Structure Inside Earth's Core.

The Earth’s interior is far more complex than what we are taught in school. Instead of just three layers- crust, mantle, and core- the Earth is made up of multiple intricate layers, each with ...