What would happen if Earth's core was completely solid?

Now if Earth's core was completely solid we would lose the magnetic field and our planet would grow cold and dead. Without this magnetic field, solar wind would strip away the atmosphere. Solar and cosmic particles will penetrate deeper causing irradiation and enormous damage to life. read more

Sure, it may not seem that way on a cold, dark morning in the dead of winter, but far below Earth's surface lies a scorching center made almost completely of metal. The outer core is an iron-and-nickel alloy that serves as a buffer between the inner core and Earth's mantle, a layer of magma and molten rock. read more

The core and mantle of Earth, as far as I know, is made up of a hot liquid magma. Will our core ever cool and become solid, and if it does how will that affect our planet and the life on it. read more