4 facts
Studies suggest the solid inner core spins slightly faster than Earth's mantle and crust, gaining about 0.08 to 0.1 degrees of longitude annually. This differential rotation is influenced by the magnetic field generated in the liquid outer core.
Scientists estimate that the Earth's core contains enough gold to cover the planet's surface with a layer nearly 1.5 feet thick. This immense amount of heavy metals sank to the core during Earth's formation due to gravity.
The inner core, a solid ball of iron and nickel, reaches temperatures of about 9,940 degrees Fahrenheit (5,500 degrees Celsius). This immense heat is generated by residual energy from planetary formation and ongoing radioactive decay.
The Earth's core contains an estimated 1.6 quadrillion tons of gold, enough to cover the planet's entire surface with a layer nearly half a meter thick. However, it's largely inaccessible.