Which material primarily composes the earth's inner core?

The earth's inner core is primarily composed of solid iron and nickel. This is due to extreme pressure and temperature conditions deep within the Earth, where the iron and nickel, which have high melting points, remain solid despite the high temperatures. The temperature in the inner core can reach up to 5,700 degrees Celsius (about 10,300 degrees Fahrenheit), yet the immense pressure prevents the iron and nickel from melting. This solid state is crucial for understanding the behavior of the Earth's magnetic field and the dynamics of the planet's interior. The composition plays a significant role in geophysical processes, including the generation of the Earth's magnetic field through the motion of molten iron in the outer core, which surrounds the solid inner core.