Video narration
What lies beneath your feet? Think of a hard-boiled egg: shell, white, and yolk, nested inside one another. Earth has three layers: crust, mantle, and core. The crust is the outer layer, with two main types. Oceanic crust is generally thinner, while continental crust is generally thicker. But here's the surprising part: the core is not one solid ball. It has an outer core and an inner core. The outer core is an extremely hot, liquid layer. The inner core is solid, held that way by immense pressure, even though it is the hottest region. And the liquid outer core is moving metal. That motion generates Earth's magnetic field-a protective shield that helps deflect charged particles from space. So, what's inside Earth? A layered world, with a moving liquid outer core helping create the magnetic field that protects us.