Which layer is made of solid iron?

A scientist observes a pair of separate chromosomes that have genes for the same trait arranged in the same order. read more

is the layer at the center of the earth. It is solid iron and nickel. It is solid because of extreme pressure. As you go from the crust towards the core, the temperature increases and the pressure increases. read more

There are two parts to core at the center of the Earth. the outer core is made of liquid iron and nickel and the inner core is made of solid iron and nickel. The inner core is solid from all off the pressure pushing down on it. read more