Solid Inner Core
It̵7;s a common misconception that the Earth̵7;s inner core is liquid; only the outer core is in a liquid state. The inner core forms a solid mass because of the tremendous pressure exerted by the other layers pressing down on it.
Location and Size
The inner core lies about 3,500 miles beneath the surface of the crust ̵1; roughly the distance from New York to Los Angeles. The inner core̵7;s diameter is roughly 1,500 miles.
Contents
Most of the Earth̵7;s inner core consists of iron; scientists speculate that it may also contain several other elements, including carbon, sulfur, potassium and silicon.
Temperature
The inner core reaches an estimated 10,000 degrees Fahrenheit -- a temperature hotter than the surface of the Sun. Although the main constituent, iron, boils at a ̶0;mere̶1; 5,000 degrees Fahrenheit, the gigantic pressures present at the center of the Earth force the core into a solid state.
Magnetism
Combined, the inner and outer cores produce the magnetic field that surrounds the Earth. As the Earth spins on its axis, the core rotates. The movement of the liquid outer core around the mostly-solid inner core creates the magnetic field due to a physical process called the dynamo effect.